Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3af61436311bded…

MALICIOUS

PDF

68.4 KB Created: 2021-04-03 16:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fc98dd60aae5b6a44964541b31fedc42 SHA-1: 0d316909ce03c6a372a87e1d4c3361740895dec8 SHA-256: d3af61436311bdeda1e09474bcf5f89a4222fa8b52b185c3c5a8615b778a5b00
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common tactic for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/wix?keyword=the+chicano+labyrinth+of+solitude+pdf PDF link annotation
    • http://mishabelle.ru/gps_kilometerzhler_app_android_kostenlosv9ibo.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/jhhXOjb/49096066717.pdfIn PDF document text
    • https://cdn.sqhk.co/fowoleleda/g8jd4ha/english_stories_for_teenagers.pdfIn PDF document text
    • http://tryadasert.online/netiwnx35m.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/jbkmYic/natolofojuvomutonanezimag.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/nikulikuwawoboda.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/0ojeSUO/jiwetubuzenawajebut.pdfIn PDF document text
    • http://penageli.getenjoyment.net/jvc_everio_hybrid_30gb_camcorder_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabovabavuwemet.rf.gd/94246740001.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_418c77edc0b944818772102f33296255.pdf?index=trueIn PDF document text
    • http://zowujobosega.rf.gd/rasesilisovalufeb.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_717ac886ca8e4b15a21715bfdc1b380c.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_16ce2dea6b854dd8908d616dea309968.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_4c4cdd68959e4e74bc96a94f39bc167f.pdf?index=trueIn PDF document text
    • http://mobijime.epizy.com/writing_task_2_sample_answers.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_b094aeef7e864062bf4dc8e6ef25bc60.pdf?index=trueIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_2588955a38c347aebdefca9c7b36b4ca.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_ee73d1ea0377412c991d729ffe295354.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_814660ec8ac7455d8036e93e6122e053.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_off0000cbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE5 5432 bytes
SHA-256: 7ede0ebc6ac9ed8c2f7a2b21d3451b27fdad6aaa8774c5bde6b358fde9849425
font_01_sfnt_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 11080 bytes
SHA-256: 041641ffa8a87f584bec11e6e955ffaaf3729922284fe0174f1df2476d4353d3

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