Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9cba75a56d1e78…

MALICIOUS

PDF

83.1 KB Created: 2021-09-24 00:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 397de23dceff68da759084d18489363a SHA-1: 6bd8d6078a40a0e5f24ca925785ae693d6b2a063 SHA-256: dc9cba75a56d1e78d61b94beb9612307189bcc3d3327b7de4830da37c781d2b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document impersonates a cloud service, a common lure to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=what+is+the+other+in+android+storage PDF link annotation
    • http://vln.nl/files/file/kefawigoxisoliwir.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210910060529.pdfIn PDF document text
    • http://starma.pl/files/file/19747343228.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/pidesupen.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0b8a8d572734a1c7f10b4af55ae5750b/64201487986.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/lebipovexitigizetup.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/satemuvomediluxawujadawob.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/boselewujona.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/24392342771.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/67712295837.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/79602480393.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/33501931677.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/vilube.pdfIn PDF document text
    • http://agilesolutions.in/uploads/4262587126.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/tajoviguz.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/90262831222.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/8609844834.pdfIn PDF document text
    • https://promise-land.com/upload/file/gavum.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/69078533874.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/lukatupabilexelulikomumud.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/paruzivizejaso.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dbec5136d---70242194452.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10476 bytes
SHA-256: dfc2c2e18105e87432c0b2e8864834a8227a206166b98b8858dac2057f91394c
font_01_sfnt_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001102b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 17860 bytes
SHA-256: 4654ecdef33087d855f2806f1d8620d7e600201c4509742911ea57b35a82429e