Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa1b8e17b7ff2b2…

MALICIOUS

PDF

76.8 KB Created: 2021-03-17 21:33:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e2ef6ca5591066a30b646fe8984206c4 SHA-1: 116fe32a7a37ac60a59703977966366ae17c8a9f SHA-256: 9fa1b8e17b7ff2b2215d1843ee8cfe389a6b1789e9932c8e3f3ad4a417d493f9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://zajinet.ru/123?utm_term=ce+compliance+full+form PDF link annotation
    • https://kuwavumiwedow.weebly.com/uploads/1/3/4/6/134673312/3340374.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/b59452aae74a8c.pdfIn PDF document text
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/1eb2b7aa16b86.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/1372988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_601e6c68660ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489834/normal_6050f7fa5c68b.pdfIn PDF document text
    • https://liroxinumapidaz.weebly.com/uploads/1/3/5/3/135348088/zanemovitosuwovofure.pdfIn PDF document text
    • https://nobexuliga.weebly.com/uploads/1/3/1/4/131405940/7744919.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/67b24bf23acf67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5fd3c02ce3755.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/66294227656.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/jekofeseteloz-vejawa-nulaf.pdfIn PDF document text
    • http://basiditdcf.space/awadhesh_premi_gana_video_songd03pg.pdfIn PDF document text
    • https://gapivawaki.weebly.com/uploads/1/3/1/8/131857152/9356498.pdfIn PDF document text
    • http://lotsmen.com/on_the_banks_of_plum_creek_chapter_16rh8cl.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/egyptian_yoga.pdfIn PDF document text
    • http://mstmail.space/offensive_basketball_plays_against_man_defensehtnjb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuxatigapisi.epizy.com/rerakuvupefukawigesekolel.pdfIn PDF document text
    • http://sinipuxi.epizy.com/nejanekupelo.pdfIn PDF document text
    • http://baxewape.myartsonline.com/pivurebujevoronivaf.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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 4888 bytes
SHA-256: de0596c9bac383c41ef0fcceb6675540b23a27c8f8a27519c56ecf6877d94988
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 11620 bytes
SHA-256: 2643e46fe79d2fa8692c563b9d8368b305ee66e5fb92db60d9308a7a2567035d

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