Malicious PDF — malware analysis report

Static analysis result for SHA-256 314de97fb9b76b87…

MALICIOUS

PDF

79.5 KB Created: 2021-03-16 04:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3f7103a610fc9d04e0945620b26729fa SHA-1: 63c309e8ccdedbda57974029a02f9767226a23ac SHA-256: 314de97fb9b76b87e2a4b09e81138412a613577bb3c68961f014d0621c325575
192 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a social engineering lure to trick the user into clicking the link, which leads to the malicious domain dafemum.ru. No scripts were extracted, but the overall pattern indicates a phishing attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/award?keyword=bodyweight+crossfit+wod+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_6040f33d04c5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410006/normal_5ff2a2086360c.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/mitasukezizofudivukufur.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/jozisamawijogupibijof.pdfIn PDF document text
    • https://nepunifanod.weebly.com/uploads/1/3/4/5/134524507/duzukolaraxaf-tugisepiladug-tolozotemogosev.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/67158248274.pdfIn PDF document text
    • http://seviregigaguz.22web.org/8953621247.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/learn_basic_html_and_css.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5ff9372f35c77.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/fagexakimiwogi.pdfIn PDF document text
    • https://benadegerabo.weebly.com/uploads/1/3/0/8/130874398/24d864b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_603bc60d81cdd.pdfIn PDF document text
    • https://tiwabegi.weebly.com/uploads/1/3/0/8/130874513/lojumipoxo.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/4_digit_addition_word_problems.pdfIn PDF document text
    • http://bupimobim.sportsontheweb.net/topasunidavu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kexomun.myartsonline.com/clinical_chemistry_book_download.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_5aa4e765f9a34425a5e622bb3b0f7697.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_5d36107a725c45dfb24ffa27d632186f.pdf?index=trueIn PDF document text
    • https://e46f8ebd-83a6-4128-9b50-8ed0babcdb17.filesusr.com/ugd/4cd51e_74b85f400b6649d589b81e5bd76906d0.pdf?index=trueIn PDF document text
    • http://favirivesez.epizy.com/zuleji.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_d708524498664a9c9981a5d73f1708e4.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 5100 bytes
SHA-256: adf91df5382854097da292baf60d020ec7907b657ec48225aed9cbb867b50e19
font_01_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 10672 bytes
SHA-256: a7061e15eff699617b18bdf1066c94c4b712a7501d7ef4206b40a59debc0f5fa
font_02_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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