Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb9e5632fec435c…

MALICIOUS

PDF

66.4 KB Created: 2021-02-14 23:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 98faedf17e0f0983b3f5b0af726703c0 SHA-1: 2c2d8f9c67d17be4730a4e1325c0399c014bb969 SHA-256: 3cb9e5632fec435c274711a6c43e05fa603a94134094a61035873b48292e81f2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

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://leonvi.ru/wix?keyword=ab+coaster+max+full+price PDF link annotation
    • http://jowopejev.22web.org/realidades_3_capitulo_1_textbook_answers.pdfIn PDF document text
    • http://logemopi.22web.org/industrial_revolution_in_the_united_states_worksheets.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/kusivodevux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5fda3eb2a7b59.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/677449.pdfIn PDF document text
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/vewofitoxa.pdfIn PDF document text
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/bosomobevaxaxe-nubotavik.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/729a466fd5c899.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/d2488ed1ab6c.pdfIn PDF document text
    • http://xojitufos.66ghz.com/zufovakomesulomabazopu.pdfIn PDF document text
    • https://radumudoxelis.weebly.com/uploads/1/3/4/2/134235428/6898bfde480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_601a381395abb.pdfIn PDF document text
    • https://vexifodukegaze.weebly.com/uploads/1/3/5/9/135977609/goloverajev_fuvilawor_mowegexonezasit_sujubanekuna.pdfIn PDF document text
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/9173873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kiwusumusi.rf.gd/bandukwala_game_free.pdfIn PDF document text
    • http://mabofikoparu.epizy.com/31287351901.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B7 5136 bytes
SHA-256: f5608f0a906afc71229129c80a4384c6ca09a9e8e2feeb18df3d9966bddd9e4b
font_01_sfnt_off0000cb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2C 10464 bytes
SHA-256: e2e6a8dcd84c65741bafb3e1b91983c47834fc595680c8fa2ccb9ea599d9bc96
font_02_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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