Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1238e22f0e917a…

MALICIOUS

PDF

72.7 KB Created: 2021-01-17 09:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b796cceda2f2ce19a245facff9a8c852 SHA-1: ee36efd792d5a7ec87ded261fe3a59e40da867d9 SHA-256: fe1238e22f0e917afb6ab82ac82e5ab18de8f4eb4e75305e3324516d3947093e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, suggesting it functions as a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://traffset.ru/123?utm_term=beware+of+the+dog+roald+dahl+conflict PDF link annotation
    • https://site-1177446.mozfiles.com/files/1177446/chicken_invaders_3_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_5fe64c24474d7.pdfIn PDF document text
    • https://site-1166605.mozfiles.com/files/1166605/92899633536.pdfIn PDF document text
    • https://site-1171417.mozfiles.com/files/1171417/jio_recharge_offers_today_list.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/GMgijab/zombie_2_werewolf_names.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/chgj4hb/necromancer_scream_raised_by_wolves.pdfIn PDF document text
    • https://site-1168300.mozfiles.com/files/1168300/download_game_idle_tap_strongman_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415525/normal_5faeb22309601.pdfIn PDF document text
    • https://site-1083679.mozfiles.com/files/1083679/govupaber.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5ff758ada45c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5fc5ed25d2f0b.pdfIn PDF document text
    • https://site-1177051.mozfiles.com/files/1177051/nixexaloboderubejividis.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/leteraxewe/xavivubiwuduja.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/29099760820.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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 5244 bytes
SHA-256: 97c8fd56b6050be5c397ce3aad661ef16f5f4e98eef6afa3a8f2c09142ddcfb9
font_01_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 10648 bytes
SHA-256: b6753e33b176180b0b4a052d5827a6dee0ad7b302cdab2176610697fbd3083a2

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