Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b0dc46840b12d7…

MALICIOUS

PDF

70.9 KB Created: 2020-12-21 02:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fcb96082b77166de2b7042a353eb8dd8 SHA-1: 141738b52278d49b09ed2698fafab48fdf00808d SHA-256: 13b0dc46840b12d790ffa44d636c1ddd06170ad5fed3c32e8404bf72045220c1
286 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document employs social engineering tactics, impersonating Facebook to lure users into installing a browser extension or update. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/gupebemezeb-sarez-nemabigora.pdf.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://trafftec.ru/aws?utm_term=firefox+browser+apk+older+version PDF link annotation
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/gupebemezeb-sarez-nemabigora.pdfIn PDF document text
    • https://babaperivagam.weebly.com/uploads/1/3/1/3/131379833/6273614.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/jerowomabok.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/begulax-molegipinutapos-xepabamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5fad57386d631.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/1bc8d866917f7b4.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/kuzasofigiwuzoj-buvifanu-tewobusof-liwakilesepeju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5fcaa988ecf96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd61008c8b18.pdfIn PDF document text
    • https://mawebexakonu.weebly.com/uploads/1/3/4/3/134390129/wuzogojukeleseme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_5fb5cf37af2d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5fde1917a33da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58424f98375720d76b8f/1606375491641/harry_potter_pillow_pottery_barn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b159dc-9957-48cf-9235-8cb95959a60c/sunurezute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73749ac8-6402-4362-a566-1a57f86b84db/60546965192.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 5416 bytes
SHA-256: 0d0c653b28b57a755cd203eacad7e5dfaa28782bd82ff1cce4bd4ded7d34557b
font_01_sfnt_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 1936 bytes
SHA-256: cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
font_02_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 11712 bytes
SHA-256: 93c832c37c0e301b9b8e92bc75804eb288b0f735b0eb89a6be90b3d4309ad8a1

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