Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b202ae7b5206dc…

MALICIOUS

PDF

86.7 KB Created: 2021-04-04 02:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0873f969ec82843d261a30f9b2e1fac8 SHA-1: 2e76f220f92a3562f555c537b41fbf00e7672a06 SHA-256: c4b202ae7b5206dc15c40afdc56d350a7ff266646a213c60bb149a6b862c7320
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 0.9998

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://midufefew.ru/award?keyword=a+room+of+one+s+own+summary+and+analysis+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5ffa57257e8ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_5fd3c1fe80576.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/FchfjgS/lopefepudipawivezesidi.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/7hijehM/96068217438.pdfIn PDF document text
    • https://dolufinome.weebly.com/uploads/1/3/5/3/135330980/pobozatujoge.pdfIn PDF document text
    • https://nagiwavimev.weebly.com/uploads/1/3/4/6/134612684/2414092.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/Z8qgiji/9453936350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416665/normal_5fee6e50b82b9.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/937fba26.pdfIn PDF document text
    • https://cdn.sqhk.co/jorafulati/ihsSALG/zalolewefok.pdfIn PDF document text
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/c16b4e5.pdfIn PDF document text
    • https://cdn.sqhk.co/wetoxojixan/3AHqnic/5444471671.pdfIn PDF document text
    • https://jumolemema.weebly.com/uploads/1/3/4/8/134853288/zovug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402261/normal_5ff9fc8567dd9.pdfIn PDF document text
    • https://cdn.sqhk.co/xejarirep/brjihb4/world_war_heroes_mod_apk_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_5fd64f80ddf10.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/webulaxej-xotatavinuje.pdfIn PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/nonefulukinuxupepuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 5372 bytes
SHA-256: 8191c863f61b10817eca4d85b4312168ca590608231be326eebbc5a61f8e0fb7
font_01_sfnt_off00012663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 11540 bytes
SHA-256: 98ac821c3db3844647ed733cf9b84689cfee716a86200f17f311b58fd6223915

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