Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25a4014e1bcff8c…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 10:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 840420af879508903b3666f8429df875 SHA-1: 5c5193d50c86ecdb44a31adfe808ecd0c9d51e1d SHA-256: b25a4014e1bcff8cdac225df2519212abacb96a296f5062176180e0a20f56316
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 0.9997

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://jottigo.ru/wix?keyword=moorpark+hs+cross+country PDF link annotation
    • https://fovodonote.weebly.com/uploads/1/3/2/7/132740633/budop.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/3265811818ra8wy.pdfIn PDF document text
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/8154345.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/nidomowitavipok.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/89226957076.pdfIn PDF document text
    • https://jogojirodatu.weebly.com/uploads/1/3/4/3/134321770/lenodakewatev_jopupilamadiji.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/7104852.pdfIn PDF document text
    • https://luwuruguvuwotom.weebly.com/uploads/1/3/0/9/130969706/jedatujotulut.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/e74e89a6cb3.pdfIn PDF document text
    • https://wamedota.weebly.com/uploads/1/3/0/8/130814674/9158327.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/zinure_fexaxopabewafav.pdfIn PDF document text
    • https://woxisuxifajise.weebly.com/uploads/1/3/5/4/135400236/degogutu.pdfIn PDF document text
    • http://phrensy.co/vulisorarituxiluvuzebrzxe1.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/himno_al_maestro_el_salvador.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/xotulevudeb.pdfIn PDF document text
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/a3799e.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/67878733784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zinudipir/how_to_add_transmission_fluid_to_a_2008_dodge_grand_caravan.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/70087851232.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/best_bolt_action_rifle_accessories.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 4876 bytes
SHA-256: 838520708d5475efb12d0a6ae9c478ac5fa029c9b98fb7d82a6be9ae4ed69d1c
font_01_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 10852 bytes
SHA-256: a1ab8302fbd370d659684bf886bc71cd39d5c82b0bae61db13a9f3c758b15a62
font_02_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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