Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ea87aca4fdcd13…

MALICIOUS

PDF

85.2 KB Created: 2021-06-14 22:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 94610b881fd821c8cdf2ced75f92edcb SHA-1: 138c190fb1b77cb8ce4d692b2ffa2ca86bee8a48 SHA-256: c3ea87aca4fdcd1394ff7754bf9122b5e562e5809790c3e71b02c31f11d7f444
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-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://philabc.ru/pbw?utm_term=german+clothing+size+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445739/normal_602d3e3275fc8.pdfIn PDF document text
    • https://mejawazur.weebly.com/uploads/1/3/4/2/134265830/05c4b09f80b.pdfIn PDF document text
    • https://kebufuwotum.weebly.com/uploads/1/3/4/0/134040355/fudef_fuxorimowi_divov.pdfIn PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/b11c26af58ddec.pdfIn PDF document text
    • https://kuwodugedo.weebly.com/uploads/1/3/0/7/130739904/xareboja.pdfIn PDF document text
    • https://lifeweroni.weebly.com/uploads/1/3/4/3/134358493/1022899.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/14f86f9c0c51dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fce8a6987d45.pdfIn PDF document text
    • https://gokipojunarofaj.weebly.com/uploads/1/3/4/6/134635425/2676919.pdfIn PDF document text
    • https://wiwotejezewol.weebly.com/uploads/1/3/4/6/134691264/xomex.pdfIn PDF document text
    • https://guxuxudisulazo.weebly.com/uploads/1/3/7/5/137504262/kodab-tezegisona-rixukobatopag.pdfIn PDF document text
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/bupip.pdfIn PDF document text
    • https://duguzimelape.weebly.com/uploads/1/3/4/6/134666192/b487d456e8a6d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevojoluvu.pbworks.com/f/introduction_to_radiologic_technology_8th_edition.pdfIn PDF document text
    • http://felefejimax.pbworks.com/f/libros_gratis_arrancame_la_vida.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/sebeloseputiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31fcb190-6552-4c53-9cdd-aee12eb2aa35/marvel_comics_free_download_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a2c3600-3c9b-4bd0-aa40-e2f3092d491f/28159881466.pdfIn PDF document text
    • http://fuvotobike.pbworks.com/f/logarithm_and_exponential_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78dd1ca-caa4-4e50-86cb-3f9402c7becf/convertidor_de_unidades_de_pulgadas_a_milimetros.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144682812/super_santa_kicker_2_unblocked_games_66.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94364839-4661-4313-b27a-78b7d9b76658/clinical_teaching_methods_in_nursing_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde4d65c-6c08-4160-a51a-41e0f23b0e18/www.funcionjudicial-guayas.gob.ec_consulta_de_pensiones_alimenticias.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_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 5292 bytes
SHA-256: c36d982e8e3c53e639e58c79c035e7217c1cd20c7f4c89c96b1043d7a9563ce1
font_01_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 11828 bytes
SHA-256: dfe6ffaa935398164a6997ccc91e4a34a9cd9ebdf9efe84a3c4c2681926e3eef