Malicious PDF — malware analysis report

Static analysis result for SHA-256 610ce7969f29d192…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 08:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cecd3456afb2c1674188f17eca9d3cc0 SHA-1: 7c4a50b30e71cefcaec3876569ad939ad65c36a0 SHA-256: 610ce7969f29d192465a826663ef3d2dd3565207eca6354dece3614ac57e5b4a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous external URIs, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a non-clustered link farm on disposable hosting, reinforcing the malicious nature of the document.

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://druttle.ru/award?keyword=celsius+to+f+chart+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378425/normal_6015b07027d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_605560986a5e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5ff28dd113626.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/how_to_repair_an_igloo_portable_ice_maker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445743/normal_6007d2a18e22f.pdfIn PDF document text
    • http://xizapataruxeku.mygamesonline.org/oceanography_for_upsc.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/functional_analysis_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_600bf0b280f57.pdfIn PDF document text
    • http://pojibuvuj.mygamesonline.org/bavugok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fd62b1d4d8fc.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/omc_cobra_outdrive_repair.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/hospital_architecture_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5fd70894ee94b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_60621b1f4d9b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_bb43158969c7437194eabc88fb44820f.pdf?index=trueIn PDF document text
    • http://zodiripek.myartsonline.com/rolowidasot.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_44ce71aac83545628a666c36c4379e31.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_72861befc4a74d19a81e27054fddf780.pdf?index=trueIn PDF document text
    • http://kozogasivufi.myartsonline.com/92351708943.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_a620f6382e2d46b8b2c91f05e6a3927c.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_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 5148 bytes
SHA-256: 8d97d57747cb0204c4a3eb3e0505597ec92c99e5dde65b1bb1f502936a0e18e9
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 11656 bytes
SHA-256: 6da8cc57a67e3826c4f3544fd191edce63d97da516c50a57f262597f1cfd3d45

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