Malicious PDF — malware analysis report

Static analysis result for SHA-256 370511f485a63fa4…

MALICIOUS

PDF

75.2 KB Created: 2021-02-22 07:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6007414da70cf67507c633df12b9ca26 SHA-1: 2de727309d2ec58f610436167a539e887ce236fd SHA-256: 370511f485a63fa4fba1ad351f727f8d210616d0dd4f81a4acdd6884a5ed7c59
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with the primary suspicious URL being https://jacksth.ru/strik?utm_term=under+the+dome+season+3+episode+2+recap, suggesting a phishing or scam attempt. The document body's content, including a fake recap title, supports the phishing lure. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=under+the+dome+season+3+episode+2+recap
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/mogibusemu-nurepebizile.pdf
    • https://jojeditisiteso.weebly.com/uploads/1/3/1/6/131606373/venesojagatap-xazatuxixawe-rowojit-laxepebevaxipu.pdf
    • https://japugaze.weebly.com/uploads/1/3/5/2/135295186/lukajuxesutakim_vupakofijiwa_gebazupoj.pdf
    • http://gejejok.iblogger.org/65494429169.pdf
    • https://xorimaki.weebly.com/uploads/1/3/0/7/130739578/tovuxavawudazi-fodogutiniwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dowadotiju/performance_appraisal_process_steps_ppt.pdf
    • http://bezopiwuzalobit.rf.gd/81799582950.pdf
    • https://s3.amazonaws.com/jonora/75716404094.pdf
    • https://s3.amazonaws.com/wulotugadag/assurance_wireless_apn_settings_android.pdf
    • https://s3.amazonaws.com/bidurudilidujug/egyptian_cotton_bath_sheet.pdf
    • http://duzujijola.epizy.com/curacao_beaches_map.pdf
    • https://s3.amazonaws.com/dugibabafod/50cc_scooter_repair_kit.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_off0000e918.bin
0b663e5a6e6a0d3d8977b15c181515b4a63b55e08907647d118fd17f6435d733
pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 5568 bytes
font_01_sfnt_off0000fbe1.bin
899b3ece993d6ac113868b9f3847d27d7639ce463f702eee8d95dad9e58f86bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 10628 bytes