Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd272a47e8ed391…

MALICIOUS

PDF

75.9 KB Created: 2021-01-12 07:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9a0121f471f530ef9702988fa8acb12 SHA-1: d57cdfb74923dfb579c5579ae556a587710ed2af SHA-256: 9bd272a47e8ed391749978a356dd224b63e1b6ff812f81676af9dd0e69b99788
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and one specific URL with a 'faces of weed' query parameter. This structure strongly suggests a link farm designed to redirect users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection confirm the malicious nature of the file.

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://traffine.ru/123?utm_term=faces+of+weed+before+and+after
    • https://cdn.sqhk.co/widexerun/jMQii0y/shooter_jennings_married_misty_swain.pdf
    • https://site-1180945.mozfiles.com/files/1180945/new_qawwali_ajmer_sharif.pdf
    • https://site-1171585.mozfiles.com/files/1171585/flow_free_game_download_for_pc.pdf
    • https://site-1242655.mozfiles.com/files/1242655/cue_sheet_format_for_election.pdf
    • https://munibejexa.weebly.com/uploads/1/3/1/4/131414516/wijokojafesek.pdf
    • https://site-1168007.mozfiles.com/files/1168007/easy_21st_birthday_cake_decorating_ideas.pdf
    • https://site-1176615.mozfiles.com/files/1176615/27818509172.pdf
    • https://site-1177484.mozfiles.com/files/1177484/fitizejinotefopijewebet.pdf
    • https://cdn-cms.f-static.net/uploads/4457847/normal_5fad968bf0ca2.pdf
    • https://site-1173293.mozfiles.com/files/1173293/pizzaiolo_oakland_wifi.pdf
    • https://static.s123-cdn-static.com/uploads/4391001/normal_5ffb14bdbbba0.pdf
    • https://site-1166064.mozfiles.com/files/1166064/fibaliwadafebalik.pdf
    • https://site-1178057.mozfiles.com/files/1178057/dixojitidelenaroronexawit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vuforewebub/assertthat_example_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfad.bin
a59dbd0498233692939f6953d6717932db34cd88bbb8f5ee27459eaa45a5186c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 4908 bytes
font_01_sfnt_off0000f06e.bin
91e47002674537a9bcede63f7ba32e249864f27aa99728bbe1abaad71ab80a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10432 bytes
font_02_sfnt_off000113fb.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 4324 bytes

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