Malicious PDF — malware analysis report

Static analysis result for SHA-256 51598b6f4b437802…

MALICIOUS

PDF

76.2 KB Created: 2021-02-22 12:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6de0bda54d8381b0725a5399580f2106 SHA-1: a28c569c5255f99de33134091aed8ba8d326ad9d SHA-256: 51598b6f4b437802cc1d5e0bcd24a3254b09a12df6b19c009e6c9ad23b20eef3
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to wkhtmltopdf and a review keyword, likely serving as a lure.

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://bologen.ru/wix?keyword=nike+flex+supreme+tr+3+review PDF link annotation
    • https://cdn.sqhk.co/pixazizaze/er9hhgc/dreamline_enigma_shower_door_installation_video.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/lezagufoledonedagubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497359/normal_6013593375f9a.pdfIn PDF document text
    • https://fokomawirofuteb.weebly.com/uploads/1/3/0/9/130969657/lijiteji.pdfIn PDF document text
    • https://lutunorozepilaw.weebly.com/uploads/1/3/1/4/131438778/b94c9952ad.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/fBYia6b/xojisopilazizotumiri.pdfIn PDF document text
    • https://cdn.sqhk.co/fixijolexap/hhMjfMB/veteninulawopudafexapavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_602e5dbe2680a.pdfIn PDF document text
    • https://cdn.sqhk.co/givikufat/iglhiF3/jelly_shift_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/fhjU1hi/tactical_sling_bag_with_water_bottle_holder.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/5a4fc.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/0tha0he/46957011230.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/Xigmihi/nixefugewa.pdfIn PDF document text
    • https://pezazexumazu.weebly.com/uploads/1/3/5/3/135392870/513900.pdfIn PDF document text
    • https://sagiwotagemo.weebly.com/uploads/1/3/1/8/131871993/0be528a390a297.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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 5252 bytes
SHA-256: 2da50b81e8ebf7802974b425f8a972a9285c7e25818079b480d9850f1bf7c0a9
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 13000 bytes
SHA-256: 3494638949451ba927582b36298d938959a2e9a2778ddd97ef7d57d6979b03e3

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