Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc925821bc9d36f…

MALICIOUS

PDF

86.3 KB Created: 2021-03-11 14:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0018c8a2baea1cc4b7b8d4c2bfd4ddab SHA-1: 5b76b5293a8184a2990bf608b7a3eff43f0d7e10 SHA-256: afc925821bc9d36f9d5cebb0c4ab35c4c0d7089fd39c71794c45dd78828c1f6e
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/aws?utm_term=how+do+you+trade+options+on+webull+desktop PDF link annotation
    • https://nisudine.weebly.com/uploads/1/3/1/4/131454656/144437.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/fjhicib/40754851579.pdfIn PDF document text
    • https://cdn.sqhk.co/fitodofafe/dVvdzbA/91014537411.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/vojina_bipodizavanabu_xidawikofi.pdfIn PDF document text
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/goregapu.pdfIn PDF document text
    • https://woliwaluv.weebly.com/uploads/1/3/4/6/134686062/f331dc4928ec.pdfIn PDF document text
    • https://tizezesi.weebly.com/uploads/1/3/4/0/134041120/9fc65399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493569/normal_5ffebb13e6608.pdfIn PDF document text
    • https://cdn.sqhk.co/tezabulaw/yjhohe7/pigakenefodorada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_602882cd6b1c3.pdfIn PDF document text
    • https://gejabadofezeda.weebly.com/uploads/1/3/2/6/132681436/dakusix.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/wewubejasezumavezix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368222/normal_5ffe470389f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_602543e3d1a91.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/rGZfheW/remafiwatoratogutusegen.pdfIn PDF document text
    • https://lakupofudeb.weebly.com/uploads/1/3/0/7/130775354/fodifajisi.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/c7687d77-b7cb-40c3-a6e3-534e2748f7a7/why_does_my_dryer_not_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/how_do_you_clean_the_filter_on_a_dyson_cinetic_big_ball_animal.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/84244784970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3a607e-6b86-47f1-99b0-a4222f6e4775/90890758854.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_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 5312 bytes
SHA-256: 5b9e806d29fdd1132217d061a6499e90c51c535123adec2226927ab6f315e4c3
font_01_sfnt_off000125e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 10928 bytes
SHA-256: a2342aae5489c315b7ef6e0620657a8b63a081e1a02c4d4dee91308f162c2e5a

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