Malicious PDF — malware analysis report

Static analysis result for SHA-256 921ae0d5d829a9a2…

MALICIOUS

PDF

76.3 KB Created: 2021-02-27 10:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 61489f0602ed3bfda0e36368ea57c232 SHA-1: 947f43a17be3bb49ba7b6c420e16733a9bc41d1f SHA-256: 921ae0d5d829a9a27da9ea2e3bb65a1f08b0a879b7707db5d8c93a2969490f60
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier as malicious and contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The presence of a credential phishing lure impersonating Amazon, along with numerous embedded URLs, indicates a likely attempt to redirect users to malicious sites for credential harvesting or malware distribution. While no scripts were directly extracted, the nature of the heuristics and embedded URLs points towards exploitation and potential client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/giguvolore_wipekatarakawaz_wikuzoxorotulu.pdf.
  • 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://bologen.ru/wix?keyword=two+column+proofs+practice+worksheets+with+answers PDF link annotation
    • http://xawegap.mywebcommunity.org/bujidadoturi.pdfIn PDF document text
    • http://disconto50.pro/informatica_etl_interview_questions_and_answers2hqjp.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/2ZhdgdS/zizebubirudixinasulid.pdfIn PDF document text
    • http://about-igsupport.com/tibemopuxale9y5qx.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/ididjhg/37125231546.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/c6jijdj/mk11_mk9_skins.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/geihggF/52527044793.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/giguvolore_wipekatarakawaz_wikuzoxorotulu.pdfIn PDF document text
    • http://creditstar-kabinet.com/nemolijanolekaruji32.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/gdjeNhd/pc_minecraft_hopper_recipe.pdfIn PDF document text
    • https://ponirusorigimo.weebly.com/uploads/1/3/0/7/130738629/lunuk_toferenev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/69430732408.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/play_store_modded_apk_no_root.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/baby_bjorn_travel_crib_light_fitted_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/finders_seekers_answers_petra.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_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 5360 bytes
SHA-256: 5a30405f6e804484b4c745f248c968d6066dc8b303f3df6766d3c2b48e2bd077
font_01_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 11104 bytes
SHA-256: 83a0b6db646b96d4e3d776408ba38a54825194f520de291401f81aa365e4ba03

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