Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0f207df1f42540…

MALICIOUS

PDF

75.3 KB Created: 2021-03-24 17:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b5ad4dde836d7bd3ecf557306afe4c6 SHA-1: 753c878952afb837d262ef09f489d3de3ec9188c SHA-256: 3f0f207df1f42540977fc287c58685139e3f105d7c86d1feacdd44d1b320ea69
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a prominent one disguised as a search query for a common technical issue. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to redirect to a malicious site. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit user curiosity and lead them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/aws?utm_term=how+to+turn+off+ihome+bluetooth+keyboard
    • https://cdn.sqhk.co/nemazuwigumo/ibpt4id/42306818198.pdf
    • https://cdn-cms.f-static.net/uploads/4476147/normal_60136a10eeaff.pdf
    • https://pitaxevidadud.weebly.com/uploads/1/3/2/8/132815172/kopapiwe.pdf
    • https://pazolumaf.weebly.com/uploads/1/3/4/3/134356568/3999986.pdf
    • https://cdn.sqhk.co/moromasi/ieja2gj/waburojaligukifedunagaru.pdf
    • https://cdn.sqhk.co/lunabati/jaTQhcq/28100054227.pdf
    • http://wulixiv.sportsontheweb.net/documents_to_converter.pdf
    • https://cdn.sqhk.co/limiwebu/hhh9V9Q/chilis_to_go_job.pdf
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fe3eb188ca94.pdf
    • https://cdn-cms.f-static.net/uploads/4459785/normal_602541efd41f9.pdf
    • https://taxefijiduru.weebly.com/uploads/1/3/5/3/135311915/dewikejuzukopino.pdf
    • https://cdn-cms.f-static.net/uploads/4389794/normal_603ff2a594257.pdf
    • http://mebevevi.mywebcommunity.org/pipom.pdf
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fcdd6d5d0bd8.pdf
    • https://cdn-cms.f-static.net/uploads/4454824/normal_6025e33cec5e8.pdf
    • https://cdn-cms.f-static.net/uploads/4447906/normal_603f7989d6029.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sinamozagemoger/sat_practice_test_1_answers_ivy_global.pdf
    • https://s3.amazonaws.com/bejokazemur/faxivavigigufirapaxe.pdf
    • http://zuxokoberibaw.atwebpages.com/viborofoxobejiwibonuxa.pdf
    • https://s3.amazonaws.com/vesubodufisi/71820024648.pdf
    • https://s3.amazonaws.com/mipizaju/dofeje.pdf
    • https://s3.amazonaws.com/lebejos/how_much_is_a_32_inch_sony_bravia.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_off0000e981.bin
256da633a402a53cb82fa67d49a098974bc643549f644e6922e3a8226fa60e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 5328 bytes
font_01_sfnt_off0000fb81.bin
b41776c8f7ac86c9438800c910618805ddff0ed2d95f437f5a367821a3286f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 10840 bytes

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