Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6aa9944c72f3d2…

MALICIOUS

PDF

81.0 KB Created: 2021-03-08 16:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c37a830a76300739d4d545cdb1569c8a SHA-1: b956eb8f848e5ec52afde761b00d6a0bbe8b9b4f SHA-256: af6aa9944c72f3d2109acefe4af085022f615c75bc7b67bc20618536a66c9e89
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://druttle.ru/aws?utm_term=what+food+should+i+avoid+to+lose+belly+fat PDF link annotation
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/wojememuvokolamik.pdfIn PDF document text
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/33111a.pdfIn PDF document text
    • http://bonboxstudio.com/19904185629elhmi.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/gggfnmi/taxanagarewulenanidivosak.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/jZhfjjn/59753673383.pdfIn PDF document text
    • http://chaptejvxz.fun/fisiologia_guyton_gratism1iko.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/what_type_of_oil_does_a_chevy_traverse_use.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/ghdAjf9/vesipifalak.pdfIn PDF document text
    • http://esagafow.fun/android_app_pending2jg0o.pdfIn PDF document text
    • http://1xbet-registrat.site/likitacv7zp.pdfIn PDF document text
    • http://lnstagramoriginal.com/31086040849tmqg5.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/gulag_sasugu.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/i7sjdAp/scary_teacher_3d_free_for_android.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/zibukenu.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/how_to_buy_shares_in_the_stock_market_for_beginners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_0b6459f61ca641ba940ca232e2505685.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fopalew/how_to_become_it_auditor_certified.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/menonalimutibudosage.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_fabbe95f78e44cdaa7ef50c4eb305106.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadedosi/99452118907.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/gutun.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/gamefowl_conditioning_guide.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_4707b7e6fa1b44bfbe41dc17a2c99a43.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 5212 bytes
SHA-256: 67fcdd8a179df34a7e8dacf71090f84a38a499b246e12f6be1f06de136f51fd9
font_01_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 11396 bytes
SHA-256: d8dab039d3f45fd74a36d3c38b7728e9caa4c453bb908c5eb372512b011a7bc4

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