Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f905d56dce6479…

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 03:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 43fd73c82488f25364fed48ede880d27 SHA-1: b8cb7485790c71d6c46d86b0a21a575fd0605b1d SHA-256: b1f905d56dce647917e5105bf83c0b26760c9bbff002a9c9e7e7c30b3f1edb6a
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination.

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://nipisod.ru/award?keyword=characteristics+of+bureaucratic+organization+pdf PDF link annotation
    • http://zonizubiro.getenjoyment.net/juwowekife.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/18592954560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474987/normal_60469bd1683f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_60248ab9b2182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491168/normal_5ffe6f15054e0.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/blackstone_real_estate_debt_strategies.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/57685235720.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/97627932330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5ff65ecd72aa4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_c15fd035b91e404ca93bf58e24685af3.pdf?index=trueIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_5e91002d4cc04ec4a1ec01b62f6cd4b2.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_e28eb36086684275b7fff17a52a793ad.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_a29df64603164c54997e5d2bdbbf0d1e.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_b9ad36a58a304923a4b3195eab8578d3.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_7df7fdc4706e4bf9afd10075a57fdd55.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_fd8e1c353b57417089e2b85ffaf705ff.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_2b9c0953abbc4fc9a5fe1dc84d2d7627.pdf?index=trueIn PDF document text
    • http://segurixuzek.myartsonline.com/photosynthesis_review_worksheet_middle_school.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/8_parts_of_speech_with_meaning_and_examples_slideshare.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_28a78c57574148a5b04cbea6a44bcae8.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 5480 bytes
SHA-256: 30170f5cd80a67375c681bf754b2e71774fcfbbc4f6e345dcfcb9c42d8602799
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10384 bytes
SHA-256: 9a6e4b4d0da8a9d6f73859c73a1b7e8920f0ef373ea989cf175e436f162f6287

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