Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3f0a0744a5258d…

MALICIOUS

PDF

113.2 KB Created: 2021-03-30 16:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e0543bf06f64112b0ab08bd7174e90ae SHA-1: 26e830eb45492775dd0a75a5afdc2ff468404887 SHA-256: ce3f0a0744a5258dfb685873d1406e476a303bec7707e11c539a089d4f968176
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/wix?keyword=spy+5000m+motorcycle+alarm+installation+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fe4d50584b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_602978c7d4741.pdfIn PDF document text
    • http://zitulexe.iblogger.org/samsung_6500_dryer.pdfIn PDF document text
    • https://jinajifija.weebly.com/uploads/1/3/4/8/134889339/881553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_6032fb5e22ec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_603c63f36a18e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_6015ba563071a.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/nejagekepufab.pdfIn PDF document text
    • http://zonodejizifiti.iblogger.org/what_kind_of_conjunction_is_therefore.pdfIn PDF document text
    • https://sosatiga.weebly.com/uploads/1/3/1/1/131164398/5912771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_60442540575a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504641/normal_600558f1c162b.pdfIn PDF document text
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/620171.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_5ff6720ea8f13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_137f16cacded48779228dcc42436d422.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_40ec06be3ac34c41b646488306b515ae.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_a341096caf46479189397e6825ce458b.pdf?index=trueIn PDF document text
    • http://bixorup.epizy.com/cadillacs_and_dinosaurs_2_game_free.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_b2d9327ffb504b49ba0e9e918271cca6.pdf?index=trueIn PDF document text
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_c4d0200d329f4fbdacbabfd5c195ef6c.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_437e00dd018348c49507333eebf5b204.pdf?index=trueIn PDF document text
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_3840272a0b374e0f861856b4be83bd90.pdf?index=trueIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_f189d113eb6d41bf92ed6e69e434c626.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_ae968e020ded4ec7961b73b3a07504b5.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_off00017b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3B 5552 bytes
SHA-256: 3306e2028dc08c08ecc6a82876f364d0e840a229c010920e0425eac7dc53a8fa
font_01_sfnt_off00018e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E0E 11976 bytes
SHA-256: 02eafe66b3fca55e0b7d38d77d09500befd55b78224a80faa84eaeb25f957174

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