Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ca89a7304d7863…

MALICIOUS

PDF

84.8 KB Created: 2021-03-17 16:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 516f22faeabb8261833b9465e2120516 SHA-1: 971944ab83e8ae068f1437aed86537bfd74156b8 SHA-256: b5ca89a7304d78630dab1dddd9625a816db2c68de91e8e53650010e5c0137f79
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 0.9991

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://lozipotod.ru/wix?keyword=barking+up+the+wrong+tree+book+pdf+free+download PDF link annotation
    • https://kigotofu.weebly.com/uploads/1/3/5/3/135323523/32ea737c5df9.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/jjIiegj/bofukolozufanunadinaleku.pdfIn PDF document text
    • http://plusstore.pro/vetezenitirilepifr9fy.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/ihxiiih/10121366570.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/AEhg8As/87547663421.pdfIn PDF document text
    • https://lojizeli.weebly.com/uploads/1/3/3/9/133997115/fixutumil-nepipo-zaxuxapovu.pdfIn PDF document text
    • http://cashbackmoney.info/66817428784cberm.pdfIn PDF document text
    • http://usesoda.pro/74140312068857ex.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/nbs1pMC/vurupatedi.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/66036638194ogphs.pdfIn PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/9343531.pdfIn PDF document text
    • https://lavefikamov.weebly.com/uploads/1/3/0/8/130813740/wuvajifi_pumituvit_rizunerowejexog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_6d362e46d1d04fcfa536c44082f8009a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/tolofipezizetunamuzebupa.pdfIn PDF document text
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_def1e2bf00bd4a7398400e4f0be5e30f.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_9db116013c8d4afa96809674bb9f41c3.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_ca147b2ce58442f88cf186ce1e04d76a.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_a215d9b1c3fd4a87a58a757a74888ae3.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_164bed61426745a5ba7c63e6a4a6f8cb.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_3fd101576a6c4e02be70acb43b7a35c6.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_9facbab776444d29ac4559261b6b852e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/93606333673.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/88817129845.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_267b59dde0e34d2ba4463345520b7961.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fazujo/does_the_roomba_e5_have_mapping.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_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 5468 bytes
SHA-256: 35a666f2ecce0e8cb217844f439177c6e4a2002eda8f84c7d56cd917c4605f51
font_01_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 14128 bytes
SHA-256: 6d4e8834ae9f63c47ab4e53678a28fb250144705771cf754a1747e78b97bd8e4