Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a71d42764473a3…

MALICIOUS

PDF

70.9 KB Created: 2021-01-01 00:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bc2ef22333a51a96518d861a85072f74 SHA-1: 925eb91c708054ce343781c0c98b7df7d911ec62 SHA-256: d9a71d42764473a32a5fbb9521baed59187a032715b3c6cd7ea145889b8ddc07
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://trafffi.ru/strik?utm_term=hd+video+player+online+free PDF link annotation
    • https://cdn.sqhk.co/lamikolo/cjjabc5/unofficial_handbook_of_marvel_comics_creators.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/4656879.pdfIn PDF document text
    • https://wovokuvodopi.weebly.com/uploads/1/3/4/6/134685597/daxewujom.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/ig8Of7t/52421081827.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/EidjaEO/ninja_jungle_adventure_mode.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefoveniri/Uijghes/odd_eye_circle_album.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/KShkIjd/globe_at_home_prepaid_wifi_review.pdfIn PDF document text
    • https://tobuzedatenet.weebly.com/uploads/1/3/4/3/134322281/55992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/395b968a-7256-44dc-8ea0-2a3e340e1d5b/classroom_aquatic_oyun_indir_club.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d326ec6-a679-4512-989c-e3dd840c4a48/vadividugizinudasaval.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_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 4980 bytes
SHA-256: 97dd68c15e63c74521cffbc24df8a7bff1c6ea0b0be08bfdd66c6ca6423d829d
font_01_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 11372 bytes
SHA-256: 6547c97b18ff901d2125ecb16790d4cb5a85d9272bf8a14411fe7f32288c0053