Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d460249ff0417f…

MALICIOUS

PDF

77.8 KB Created: 2021-04-16 05:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f042d2cbb7685e0d6f5a2e57e9a210ab SHA-1: 50e95b2619263139697f99249f53cea28fbe613a SHA-256: a7d460249ff0417ffefde802b47335a7fcde1c8b4e43b87f461fc5be451b4e42
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 0.9996

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://dugedepap.ru/strik?utm_term=french+vocabulary+app+for+android PDF link annotation
    • https://cdn.sqhk.co/wasusoguba/iadS4c3/nogopabawuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5fe981f6ecdd5.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/90861817899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_60020ff4aeb24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_602154962265a.pdfIn PDF document text
    • https://pusosisuko.weebly.com/uploads/1/3/6/0/136094517/6733730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5ffff5196c525.pdfIn PDF document text
    • http://supusatode.sportsontheweb.net/nomojo.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/YQgigKE/ludo_game_download_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/xidhjjb/sivetofulatubefoxer.pdfIn PDF document text
    • https://cdn.sqhk.co/guzelatolina/hihhjbe/lemon_cake_recipe_from_scratch_no_buttermilk.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/dorotowapakideneraresanel.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/atevkgg/checkers_hyper_vacancies.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/hbieNRw/endoscope_camera_for_android_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_604915809c37e.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/apc_smart-ups_1500va_lcd_230v_with_smartconnect.pdfIn PDF document text
    • https://jewolitef.weebly.com/uploads/1/3/4/0/134016805/zemeba.pdfIn PDF document text
    • https://cdn.sqhk.co/setewefasari/jhgehjn/wobupomibu.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/guxosa/32642855055.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/nukeraxulo.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/keto_diet_every_day_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/the_missing_movie_2003_download_in_hindi_300mb.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_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 5320 bytes
SHA-256: 4591e325db2a164c12540e359b05c204ff8b0bf40f5f1d05a6b3fb9514865ddf
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 11084 bytes
SHA-256: d75be14e1512ebf5c7c33805c50d7c1f86ba7d7ed01dc48ae918f13d35696d2b

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