Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c678f110692c24f…

MALICIOUS

PDF

67.3 KB Created: 2021-03-01 02:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: acd1eddd0c6e52a306a0636be13331b8 SHA-1: 15fb0494538110b13e0224c086bb2b99b7252fea SHA-256: 7c678f110692c24f53dce67d76eb3fb57bcf621dbbdadce9a1b070e6c8455d4f
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the document body, despite being heavily obfuscated, suggest an attempt to redirect users to external, potentially malicious sites. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=bedtime+stories+read+along PDF link annotation
    • http://xitabijasava.getenjoyment.net/50073580521.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/juxudelonaxasixovatuten.pdfIn PDF document text
    • http://ipoteka.net/47381293662bjiqf.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/msoe_nursing_acceptance_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/SucX91l/guilty_gear_xrd_rev_2_review.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/68174724997.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/bibigp0/fast_food_food_near_me_that_delivers.pdfIn PDF document text
    • http://zuvels.xyz/black_ripped_boyfriend_jeans_plus_size092vu.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/22585089631.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/99541176271.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/54746274149.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/vajutiwavopaxa.pdfIn PDF document text
    • http://mmmmmme.space/best_olympus_om_macro_lens2b4ik.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/kFFBBjj/pinball_arcade_museum_st_petersburg_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/wgdfWjj/sea_empire_ap_human_geography.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/the_natural_book_series.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_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 5192 bytes
SHA-256: 11041893df9bbb03a35067e3dedcf6526f14718d19f12ff6fbd833bc69be7e11
font_01_sfnt_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 10048 bytes
SHA-256: 8f89a96cadea16216cf36ae8471b993fa3c14b2286682ef582aeff115ca94af4

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