Malicious PDF — malware analysis report

Static analysis result for SHA-256 21469d650270eaa9…

MALICIOUS

PDF

74.9 KB Created: 2021-01-15 00:36:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7f7dccd4141ee8ecf3a5f98d8d425066 SHA-1: e2a8a617f073ff5481d3b34adbd485c9f4662833 SHA-256: 21469d650270eaa931880e2caae4925d8e4d2ffcace5f986357a0b3666d6b740
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/aws?utm_term=dwg+trueview+export+to+pdf PDF link annotation
    • https://cdn.sqhk.co/lufezeralon/jgfMVja/red_sun_yoga.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/hihegc4/small_plastic_shredder_machine_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fe93510c31a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_5fa6120d9c8b1.pdfIn PDF document text
    • https://site-1176728.mozfiles.com/files/1176728/jitopimejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_5fd9a2a65d5b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fb4f2acd7244.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/aSMjajj/gozugojav.pdfIn PDF document text
    • https://cdn.sqhk.co/bomaguvodar/gihhhCw/craigslist_denver_free_kittens.pdfIn PDF document text
    • https://site-1175555.mozfiles.com/files/1175555/brick_breaker_ball_stuck.pdfIn PDF document text
    • https://site-1168096.mozfiles.com/files/1168096/snow_white_and_the_huntsman_disney_trailer.pdfIn PDF document text
    • https://site-1171887.mozfiles.com/files/1171887/83342619214.pdfIn PDF document text
    • https://site-1177895.mozfiles.com/files/1177895/anthem_of_heroes_mods_steam.pdfIn PDF document text
    • https://site-1175083.mozfiles.com/files/1175083/fill_in_3d_apple.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408721/normal_5fcaa7b0cb82c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 3220 bytes
SHA-256: af443ce705348601f68b197baf710081a466f9d95fb60642de925ad7296036e1
font_01_sfnt_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 5008 bytes
SHA-256: 47b62af83af89299f468cc82cd645e90e14c81b90b854c346694921e316fca62
font_02_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 12152 bytes
SHA-256: 4bae840692afef9125d3f1f6a7bc815f25e1404abba42c494db723894cb1498f

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