Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8768d6aaf3ae32c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-30 12:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f822a439e36c8e1ed605203671076a9f SHA-1: 26a66c64e86ddc0ea4d1f65cc2741ca4cd9aaaae SHA-256: a8768d6aaf3ae32cad0aa5f2c1eda0fd130d790d148ae69abf84dc9d2ef50312
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=crear+revista+digital+para+android PDF link annotation
    • http://kamakuralosgatos.com/uploads/files/20339071285.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210929103740_930263946.pdfIn PDF document text
    • http://fygl.net/uploads/file/161130334806.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/52046003470.pdfIn PDF document text
    • http://373113.linker.tw/files/zipodibitabadirido.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/vipodibip.pdfIn PDF document text
    • https://expomediainc.com/upload/file/fawuw.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/51199416619.pdfIn PDF document text
    • http://ministerium.pt/files/65882358895.pdfIn PDF document text
    • https://allianztc.ro/files/file/94970922186.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/46994229859.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a9ca74b34f0c45181073038326b5e1ab/55037478976.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/9123919560.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210927181623229.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/kijowamopufudunukedu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614546d4af8cf---jidudejamow.pdfIn PDF document text
    • http://coffee33.ru/archive/file/varuza.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/26990492979.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/turenenawuxat.pdfIn PDF document text
    • https://latework.cz/soubory/87256677362.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/9301879955.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_off0000bc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 18256 bytes
SHA-256: ef440e585d1cd80b4815034a216eaff258a260f25b938d28e016c181153e010a
font_02_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 10664 bytes
SHA-256: 71c9b730a70531538ce27512763fa846814a6ba033680b0edec69a786711e99d

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