Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a153ab4a8082250…

MALICIOUS

PDF

72.1 KB Created: 2021-06-01 13:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 51fd822367e6b2042deaaaa6e3fed96e SHA-1: 7f804c7c286819e175db26254870f0713f88f562 SHA-256: 8a153ab4a8082250d0d45594d19dfa10c9ab99800692d909279ca93cb45b2bad
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious and contains a large number of external links, many pointing to disposable domains, indicating a link farm for SEO manipulation. The primary URL, 'https://pistant.ru/pbw?utm_term=unlocking+the+queen+code+book+pdf', suggests a lure to a fake document. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristic suggest an attempt to drive traffic to malicious or SEO-abusing websites, potentially as a precursor to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/pbw?utm_term=unlocking+the+queen+code+book+pdf PDF link annotation
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/16229554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_605c997a22d17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_5fdb68bfa50fc.pdfIn PDF document text
    • https://jijajaxasivezix.weebly.com/uploads/1/3/4/5/134588510/ca2adba9.pdfIn PDF document text
    • https://jamaxukupabidi.weebly.com/uploads/1/3/4/6/134675967/fonojeturikadew_tiworolugam_damojejalerepad_vifafefo.pdfIn PDF document text
    • https://kumenukaputami.weebly.com/uploads/1/3/5/3/135346523/d76e7cdc94cb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7841f626-7aa1-47b9-a53e-2e70e2579ca3/vw_beetle_repair_manual.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144424119/77218401898.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144427800/xakazep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7045ba3-de03-440e-9eff-03e4044153fd/blood_bowl_2_team_building_guide.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/photography_portfolio_template_wordpress_free.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144453504/vikings_season_2_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7989928e-fa26-49b3-9190-ddd6660e8e9a/how_to_make_a_photo_collage_in_procreate.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/60188390700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ba4903-68fc-4374-936c-05a3f16ff800/wapijipizigavajawof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a0c842-7b9c-4744-902b-8916c32be6e1/malupebuku.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144444978/how_to_determine_bearing_size.pdfIn PDF document text
    • http://zepupifob.pbworks.com/w/file/fetch/144426390/wevixinakoduruwapexegomi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 5256 bytes
SHA-256: 2471ae7d758e4c407c9aa2cb1cd6b4d3c11618068bdea01e39ad8b6e25213ccc
font_01_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 11104 bytes
SHA-256: 79627659aed722ad07190cb694c62d151847c19014a007d78181d9f469afb441

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