Malicious PDF — malware analysis report

Static analysis result for SHA-256 5156694c8d9f04e0…

MALICIOUS

PDF

70.9 KB Created: 2021-04-30 14:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a2c67d5cfbf53ba1f89335b25ae9878b SHA-1: 78f01e28c1e664bef2063305185aa05c6d29813c SHA-256: 5156694c8d9f04e0e0f2d24ee1c62afafb49922032f9945795a67246eb70cca9
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 0.9993

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://seumenha.ru/strik?utm_term=is+there+a+film+me+after+you PDF link annotation
    • http://vujenixuwo.mypressonline.com/kerala_lottery_onam_bumper_2020_result.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_6060b5842db2a.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/ajjjjI8/roreseduxedavepawiwar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_6042703ae0e04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_606a402d77eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_604999b7d4ef3.pdfIn PDF document text
    • https://lufigukinuma.weebly.com/uploads/1/3/2/6/132680864/sakuzodefotepeg.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/fGibRjc/20229950078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_601b53e6443a9.pdfIn PDF document text
    • https://milavunaxowe.weebly.com/uploads/1/3/4/7/134717052/2102905.pdfIn PDF document text
    • https://zojezuma.weebly.com/uploads/1/3/1/3/131382028/zogidalazuzeliz_pamerar_tabutofena.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/eL5xImw/heart_appendage_procedure.pdfIn PDF document text
    • http://wokodanib.getenjoyment.net/erasmus_plus_programme_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461249/normal_603d0d930abef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_605f6cc563f0b.pdfIn PDF document text
    • http://pamatidela.getenjoyment.net/bid_bond_sample.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donufuruwitij.atwebpages.com/supply_chain_risk_management_process.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/carbonisation_of_coal.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/54488954581.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/philips_avent_microwave_sterilizer_how_much_water.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/pefivuvodijabe.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/40739679171.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 5048 bytes
SHA-256: 443b2127c383ed3a8778f1ccb56ac25b0b60996e0adfbefd905ebd6072e2a2a3
font_01_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 10548 bytes
SHA-256: c1fd645c42cde1af095f00d3e1a5d1243e71e88dead5d5f3706ac202cf1cc1e1

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