Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1687ad20aa3af53…

MALICIOUS

PDF

76.3 KB Created: 2021-05-11 17:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba9da6853d7df68079b1b58825bff215 SHA-1: be489f0bd99e6c0d185ed3d2a83723c561f9d93f SHA-256: f1687ad20aa3af538f6359f58d25cfa846acc0cbb12237e2731d512c8ef3612e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, with a primary suspicious URL pointing to 'jumiwimov.ru'. The document's structure and the presence of embedded links suggest it's designed to redirect users to potentially harmful content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+insert+references+in+word+mac
    • https://cdn-cms.f-static.net/uploads/4418170/normal_60564d0295284.pdf
    • https://cdn-cms.f-static.net/uploads/4374198/normal_6064a5f5d399e.pdf
    • https://static.s123-cdn-static.com/uploads/4474752/normal_5fe5ac13136ed.pdf
    • http://tideparipawovu.mygamesonline.org/clinical_hematology_and_fundamentals_of_hemostasis.pdf
    • http://kazimibi.getenjoyment.net/caged_system_download.pdf
    • https://cdn-cms.f-static.net/uploads/4459654/normal_60527f1430098.pdf
    • https://vosuxawa.weebly.com/uploads/1/3/1/1/131164537/bbdb748cd4ec61.pdf
    • https://cdn-cms.f-static.net/uploads/4408187/normal_601a837361ebd.pdf
    • https://cdn-cms.f-static.net/uploads/4417325/normal_6035d03a3f535.pdf
    • http://jezonikiroka.mygamesonline.org/10787628557.pdf
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5fdba5fb0a82b.pdf
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/576702.pdf
    • https://geruzusuvar.weebly.com/uploads/1/3/0/7/130776720/e15fcc4c.pdf
    • http://xibiselid.medianewsonline.com/94643186184.pdf
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/zimifugoxufanunu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosagoba/android_horizontal_progress_bar_material_design.pdf
    • https://s3.amazonaws.com/mejados/texoxuminokepof.pdf
    • https://s3.amazonaws.com/wukevirenesu/67438512790.pdf
    • https://s3.amazonaws.com/mijumomub/vikabimijareze.pdf
    • https://s3.amazonaws.com/sabegokek/oasis_water_cooler_not_working.pdf
    • https://s3.amazonaws.com/tenunud/95108888249.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/what_is_the_general_rule_of_the_pattern.pdf
    • https://s3.amazonaws.com/gimufesajo/fusalovoxutafeguzujabul.pdf
    • https://s3.amazonaws.com/tawosutosuxi/gevapasowumulewabo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed60.bin
6ef460af022c0ebcd6378bf611cf45ffa30fcc6894b80ef50b0b752134c9a259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 5188 bytes
font_01_sfnt_off0000fefb.bin
f6bcc7b79f273cecff4e71c6c8cfbb82ddf9b9f8fa2f14e6e4ff6219bf898ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 10172 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.