Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af10d02e01732e1…

MALICIOUS

PDF

88.9 KB Created: 2021-02-22 20:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 878f2986d3c6b659c4d3ad51e3175cbb SHA-1: 8bb715cc88ba4ca8398c93ec41cd347688253796 SHA-256: 0af10d02e01732e11052820284a06056e7058fb9c0c0d6d1d97edd1676d38338
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body and embedded heuristics point to a link farm strategy, with numerous URLs designed to redirect users. One prominent URL, https://jacksth.ru/strik?utm_term=diagnostico+de+enfermeria+para+trombosis+venosa+profunda, is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=diagnostico+de+enfermeria+para+trombosis+venosa+profunda PDF link annotation
    • http://the-english-temple.com/patitenefafedotevavju5x.pdfIn PDF document text
    • http://axecheat8.xyz/86255916475u0b2e.pdfIn PDF document text
    • http://bovewowi.iblogger.org/consultancy_agreement_template_uk.pdfIn PDF document text
    • http://sopizubivivelam.iblogger.org/guvivujakoniwa.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuwaxisiw/0yiiajg/muxilojimum.pdfIn PDF document text
    • http://gradstroy.su/50697372784tii3v.pdfIn PDF document text
    • http://com-copyrighit.com/wojipifakuxengq3p.pdfIn PDF document text
    • http://andyhongdigital.com/346627453872wt1x.pdfIn PDF document text
    • http://rorezorejadij.iblogger.org/is_an_executive_director_higher_than_a_vice_president.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/fasemumeve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://junopufobapepax.rf.gd/how_to_fix_electrolux_vacuum_cleaner_cord.pdfIn PDF document text
    • http://kojajopi.epizy.com/how_to_become_a_food_safety_specialist.pdfIn PDF document text
    • http://makeromevoju.rf.gd/moment_of_eighteen_songs.pdfIn PDF document text
    • http://duposavolat.rf.gd/20811665142.pdfIn PDF document text
    • http://bimivopi.epizy.com/33541284472.pdfIn PDF document text
    • http://jaxilikujo.rf.gd/39245461561.pdfIn PDF document text
    • http://pamakejexo.epizy.com/95357069108.pdfIn PDF document text
    • http://didejanumaxunef.rf.gd/91229955936.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_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 5640 bytes
SHA-256: cd68b0a8f4b687409086d8d343a5fb4f3e9ad01e376916d8fa5858ff4129d46e
font_01_sfnt_off00012cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB4 12272 bytes
SHA-256: 2e292b49e4a9cefa867394335e304ca61e75b100fe52cbeca74387bdb2d5aa05