Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85cadb69670fe49…

MALICIOUS

PDF

75.2 KB Created: 2021-04-05 17:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff5e71b759d2096cfbaa1e17ad83f0d3 SHA-1: f699f718176e1c2385fa65f87c8f4557e022b612 SHA-256: c85cadb69670fe497694fcc6360b684b19b05c6fef9b589c3cfba6db2c23ebf5
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://bologen.ru/award?keyword=research+administration+and+management+pdf PDF link annotation
    • https://cdn.sqhk.co/gusisitixinu/iajhks1/55517316233.pdfIn PDF document text
    • https://lomizagufefeg.weebly.com/uploads/1/3/4/0/134096038/11542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376849/normal_600090634dc66.pdfIn PDF document text
    • https://cdn.sqhk.co/benadujeju/4UDgejg/40231879750.pdfIn PDF document text
    • https://cdn.sqhk.co/givikofuf/eZ3Vah4/the_bowling_alley_paris_tn.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/cjcgdhh/rowuninilegupil.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/ijjj2jh/ruwulamesawuwizudujuvuzod.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/ghgfyUr/jisowojanulimepub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_605dc41b83e98.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/jkNhiji/haircut_los_angeles_county.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_60310b6c1fe85.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/nixepupiwujarudixij.pdfIn PDF document text
    • https://modulofironufi.weebly.com/uploads/1/3/4/4/134402713/dbdff355.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/g6ibgfs/extreme_car_driving_racing_3d_hile_apk.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/6c7615431ad28db.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/5f054e78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448535/normal_600203534ebf3.pdfIn PDF document text
    • https://cdn.sqhk.co/sikudile/V6icjfI/fly_plane_flight_simulator_3d_play_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_60493b76964f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6401f60-1400-4470-a4eb-68aa0cf8a0cd/pepasofopanefixixuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd6fbe0-be1e-42ac-a65f-d5a2c7238b1f/pogalapaduzaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d68ca86-0244-4365-9353-140a224ff4af/91012810579.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_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 5544 bytes
SHA-256: 69c249e015536e4d670c6f5d02a1540cc16621913911e86a59339982e21029f7
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 11416 bytes
SHA-256: 62992998db800254583574c35ba5fe3e7d09f37e21c91f19a3a969e6546b1d4f

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