Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b0d4b9227c6f37…

MALICIOUS

PDF

79.1 KB Created: 2021-05-19 11:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff28511fa2f06b169ca424b3811d5ba3 SHA-1: 7163f89284e6fa4f3c117ff424bdc25c7df6eda8 SHA-256: 00b0d4b9227c6f3746278b312b5758ddd97bbbef10f09038f5d1048ca8f688b6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URLs, 'https://kuzutuzo.ru/strik?utm_term=how+to+clean+dyson+cyclone+v6', suggests a lure related to a common search query. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+clean+dyson+cyclone+v6
    • https://static.s123-cdn-static.com/uploads/4388183/normal_5fe6033d6333e.pdf
    • https://cdn-cms.f-static.net/uploads/4381085/normal_605a5476e6cff.pdf
    • https://static.s123-cdn-static.com/uploads/4425912/normal_5fc95e361c3c1.pdf
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fcd0a0de72a2.pdf
    • https://cdn-cms.f-static.net/uploads/4481852/normal_6009d5cc800a9.pdf
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5fd15c4f379b7.pdf
    • https://cdn-cms.f-static.net/uploads/4417045/normal_6054ea36e3af3.pdf
    • https://zegazofegu.weebly.com/uploads/1/3/5/2/135296009/kurasolidamufip_xowogi.pdf
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/8076462.pdf
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/setavituko-serinafapiterom.pdf
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5ff47aa8849ae.pdf
    • https://meluwirukumipi.weebly.com/uploads/1/3/1/4/131483006/jodavix.pdf
    • https://pejolufuti.weebly.com/uploads/1/3/4/0/134018137/7821042.pdf
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5fd1007d5b6d9.pdf
    • https://xeronatorelej.weebly.com/uploads/1/3/0/8/130874120/sedufefubikegiji.pdf
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/tidekodazewo_likorufuwan.pdf
    • https://zogujajuzeve.weebly.com/uploads/1/3/5/3/135392671/f0615.pdf
    • https://dijajogid.weebly.com/uploads/1/3/0/8/130874349/ponenogomenoma_lowinubesabunal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remufuzu/rrbald._gov._in_admit_card_2018.pdf
    • https://s3.amazonaws.com/wizakokowe/digital_amazing_bible_timeline.pdf
    • https://s3.amazonaws.com/juwofuxufijup/how_to_tie_knots_for_bracelets.pdf
    • https://s3.amazonaws.com/minabiwa/what_does_arthritis_in_your_upper_back_feel_like.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/m_file_b_kha.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/54856951067.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/jazaw.pdf
    • https://s3.amazonaws.com/resisuna/motorola_surfboard_model_sb6141_specs.pdf
    • https://s3.amazonaws.com/tazibabebamep/11801796058.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a2.bin
b3b7800e031474debade43d86a6155de3a36aa1ab2eae17d429610ed76141935		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 5204 bytes
font_01_sfnt_off00010788.bin
1570335b03816ebca2b31bfae8aae8f31d9ae3cfcd44dcffe91a2759683456fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 11196 bytes

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