Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9936d88e501be5…

MALICIOUS

PDF

90.3 KB Created: 2021-03-18 23:28:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e18f0c8859e7cf4b7a0e7e01cd868a3f SHA-1: 2a0e1508e92e8f90e94381c58d07906976b5fd54 SHA-256: 2b9936d88e501be588f45a1c3672cb5d4f1af475abb6528e3cb59122aca757e6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=makalah+invertebrata+dan+vertebrata+pdf
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/zunome.pdf
    • http://rumigiwataj.getenjoyment.net/how_to_descale_a_cuisinart_keurig_coffee_maker.pdf
    • http://allieshouseofhope.com/12156477858swb5w.pdf
    • http://glasshookahcatering.com/52582860330cl9zp.pdf
    • http://kwini-fini.online/badakupatovumabebisutrvyyu.pdf
    • http://voicebftyi.com/940329712693fw82.pdf
    • https://gitapelo.weebly.com/uploads/1/3/2/6/132682700/9966777.pdf
    • http://infonewstravel.com/binusazedu4gv88.pdf
    • http://pl50off.info/hp_deskjet_3050a_ink_cartridgesdc1nn.pdf
    • http://igcopyrightverify.com/razizukodavptv4l.pdf
    • http://fipizilemuwob.medianewsonline.com/blues_guitar_songs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_2a0f5fbddaf149de9a23a286872c20f9.pdf?index=true
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_dfc0b7ae24cb49c489e43f76dddba1f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ba9c834b-4a53-4290-a594-fedf2a167f45/winujupa.pdf
    • http://fadezanunadafik.myartsonline.com/99508574597.pdf
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_27632d1c71c74b778aba703a4c500e81.pdf?index=true
    • https://uploads.strikinglycdn.com/files/386a48a6-fa8d-4f43-aa7f-5f59f270d625/john_deere_310d_backhoe_operators_manual.pdf
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_df9f14a528144e9a8a76323775ebaa13.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2938a969-df11-4bea-857d-dfb92168b3b1/conversation_with_god_video.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_off0001243f.bin
38efc5110c62cd626b13b924dfd449b7b77556b4ac153f6635d717982c609341		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 5220 bytes
font_01_sfnt_off00013608.bin
6f509dc5fa5369d360cd44f13f68a053037671a988457b28b719bf0f4872cf98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13608 10928 bytes

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