Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da4e310f8d69306…

MALICIOUS

PDF

71.0 KB Created: 2021-06-09 18:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f8bc7e95f2944e5b82fb7ada78b26f95 SHA-1: a822e4d8406e56e20a2cb8787f68a06808148fd2 SHA-256: 6da4e310f8d693063c2fc5ad78fcaea0bbcab286d67085ecdb9222b8c9460530
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 hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://huntic.ru/pbw?utm_term=chhota+bheem+movie+tamil+dubbed+download PDF link annotation
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/ec3cf120ac2828.pdfIn PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/pogatovemekub_xufadidin_mikimafavam.pdfIn PDF document text
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/8398030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_606cf14302006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494883/normal_5febb47c671b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5fe0a464b281c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_5ff890b4a66cd.pdfIn PDF document text
    • https://wafumaxa.weebly.com/uploads/1/3/5/4/135400811/karudamuxobapadipizi.pdfIn PDF document text
    • https://lewisenoj.weebly.com/uploads/1/3/0/9/130969481/kiribodoma_fenifun_wusofegej.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/62fd9.pdfIn PDF document text
    • https://xazunavawotop.weebly.com/uploads/1/3/4/7/134724639/3621242.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/pufabopevivubipin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fogofalo.pbworks.com/f/ib_history_hl_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fae6acc-3552-4ab6-b7a5-a1ccf245c5d1/biwavojigewuke.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144793677/198169766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b781a7a-0f4b-42b8-b063-a8ee4ed1aa79/jezibowoxijovonepebuki.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144436749/30246928495.pdfIn PDF document text
    • http://kisagew.pbworks.com/f/94401428507.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/farexoraxojovidagajes.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/w/file/fetch/144523827/zixesazosubikusetuwivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ec437c-b68d-4845-9f30-63b82de09efd/toro_personal_pace_lawn_mower_belt_replacement.pdfIn PDF document text
    • http://jutopar.pbworks.com/w/file/fetch/144719058/present_perfect_continuous_tense_ppt_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58cc357d-ef6f-4771-837b-1427b5b6cf27/how_to_use_a_mr._coffee_iced_tea_maker_instructions.pdfIn PDF document text
    • http://togusan.pbworks.com/w/file/fetch/144613716/argonautica_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c37e2e1-6d26-43a9-880b-e6aa8da07e54/how_to_use_google_classroom_for_students_youtube.pdfIn 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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 4988 bytes
SHA-256: 8d9eb560cc872be8b348f462f7830534beff64e68f06fefc363d448104c7a5c7
font_01_sfnt_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 10572 bytes
SHA-256: b980c0f9c58361e92b33c6ac3267b95b307bc308b99b6f02e8b27b84b95600f6

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