Malicious PDF — malware analysis report

Static analysis result for SHA-256 91aab3402f47422a…

MALICIOUS

PDF

72.1 KB Created: 2021-06-01 16:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 644d867bcf6176077d746a6c7bcaaf3f SHA-1: d7b19fafb442c2e294d7964bfbf38719c96492a7 SHA-256: 91aab3402f47422a7f86f510d5d959a957fffd73cd067e4e585287151c6f2776
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'https://queure.ru/pbw?utm_term=curses+hexes+and+spells+daniel+cohen', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to obscure its true purpose.

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://queure.ru/pbw?utm_term=curses+hexes+and+spells+daniel+cohen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423145/normal_606e1e673b6b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_603ae7f2c2197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_6037f8fa0ae6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_602964667c07c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4447253/normal_60b0618256ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5fe97fe85226c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_60662b21f0eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_606a87f12cd16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480904/normal_5fcb90d8513c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_6037f5020a8fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zexowisam.pbworks.com/f/is_r6_insulation_worth_it.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/48693249041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3d1138-3b5a-4727-ab57-65495970f4ec/labelele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb95c640-926f-472d-a29d-1322ff6d2c39/47469850715.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/where_can_i_buy_dog_food_for_cheaper.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/f/name_the_horror_movie_picture_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f78ee4-0858-4432-9d11-78b85cfc55ce/text_structure_meaning_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0447e008-dcd4-4c37-96f3-c97ea9c407c1/kebowefibifapax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7a1dbf-0034-4612-b283-cea8dea29c06/ipod_touch_4th_generation_glass_replacement.pdfIn PDF document text
    • http://xofitesu.pbworks.com/f/why_socialism_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7A 5052 bytes
SHA-256: 99145121efb32dffaded83dec7a4917ce246c53f98217c1e397e5b6a7b02fc44
font_01_sfnt_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 10528 bytes
SHA-256: adc886fa3d021f6ae70cf2353cbfbf8b18d41ff23c97d0906734f25d0651d0b3
font_02_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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