Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28d7d42cca0da0c…

MALICIOUS

PDF

89.7 KB Created: 2021-03-25 17:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 58fb1445906c85fc83d2e7f171b20468 SHA-1: 6b8b4ea54352d2a915405c9fd4e395e5f822b640 SHA-256: c28d7d42cca0da0c236ffc197431d6bb9772408acb56abc721518e7c60ebcffe
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, presenting numerous external links, some hosted on disposable domains, designed to impersonate cloud document sharing services. This suggests a phishing or malware distribution scheme, likely using embedded JavaScript to facilitate redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/award?keyword=pdf+to+word+android+app+download PDF link annotation
    • http://benivosefemiza.medianewsonline.com/87178250956.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416301/normal_5ffe821a3f2bf.pdfIn PDF document text
    • http://xijivedijimidip.mygamesonline.org/scaled_agile_framework_safe.pdfIn PDF document text
    • https://bawilizutiv.weebly.com/uploads/1/3/4/4/134477944/1751236.pdfIn PDF document text
    • http://detozube.scienceontheweb.net/muwuwamo.pdfIn PDF document text
    • https://ruvavebi.weebly.com/uploads/1/3/5/4/135401399/4d9b068dcb15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_600b8e7f36867.pdfIn PDF document text
    • http://lodixewovufosa.iblogger.org/psychiatry_books_for_mbbs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_6028b0a418311.pdfIn PDF document text
    • http://punejew.mygamesonline.org/kogisumibumajegu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fca0586c96a5.pdfIn PDF document text
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/xuvomagagijil-keduber-vulelawuvakiko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529977/normal_5feb48312b433.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/0ab44659a.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/f3d2bcdbfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_9172be10052044a5b6f9ab071f73ec7c.pdf?index=trueIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_f3b9dc01acf445fcb87ac7c2f543a6cb.pdf?index=trueIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_f3426e9bdebe4a8b9d6ccf17ed6c960c.pdf?index=trueIn PDF document text
    • http://gugamofizuxeg.epizy.com/dalaraguludiludokotujur.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_38bb39264896497a91c3c77a56e3f4a8.pdf?index=trueIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/roxokawaguvonozul.pdfIn PDF document text
    • http://selaxarizipa.rf.gd/risabotog.pdfIn PDF document text
    • http://ludoxijijux.rf.gd/13024400305.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_35ca4fc8b41141928803e6c2ed1323e3.pdf?index=trueIn PDF document text
    • http://kirigawegugava.epizy.com/febulidijogaxupibop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 6568 bytes
SHA-256: 18f4960a52d64bc83d6c304eee4b25c9ca37eec54c0f4efd5701b5568bea1fd1
font_01_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 4948 bytes
SHA-256: 06b198e9c18d69d2ac405ca5c4a1c7e848d8dad44b1757ac0333ef9d1c1e76dc
font_02_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 2976 bytes
SHA-256: 0091b8b9fd55cd793e1a40d74f29157664259aa2b61778244d42d5a848e78f64
font_03_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 11452 bytes
SHA-256: 13070ebda42f88cf0d9adb641af0d461ce50336a6b92f1b98e30d348990d61eb
font_04_sfnt_off000141d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D8 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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