Malicious PDF — malware analysis report

Static analysis result for SHA-256 0948386236d36158…

MALICIOUS

PDF

85.9 KB Created: 2020-11-17 06:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb15a7c27d0e18fab8f622462b14666c SHA-1: 14469178df506bf7a3d4825a06dea837a971abbb SHA-256: 0948386236d361584324441ce89adda2637d00b239b5985fd8f55e20ee0846b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, suggesting a link farm. The embedded URL and the primary link farm URL are included as IOCs. While no scripts were directly extracted, the nature of the PDF and the link farm suggest it is likely part of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=tactical+symbols+and+graphics
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/sedebepuduvi-gobipazategud.pdf
    • https://numiduramar.weebly.com/uploads/1/3/4/5/134595515/433596.pdf
    • https://lubagoxojijefam.weebly.com/uploads/1/3/4/5/134514049/ponil_kaguboz_fowubukil.pdf
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5f9acec329f77.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9891c452-efa9-4abf-b967-eeb5ae530bfa/felamorefulolobobe.pdf
    • https://uploads.strikinglycdn.com/files/32b53e38-84c3-4bbe-b525-e8706e8b3ddf/67843728306.pdf
    • https://s3.amazonaws.com/mesixadelomomo/bukvar_russian.pdf
    • https://s3.amazonaws.com/xuzed/maritime_claims_reference_manual_mcrm_2017.pdf
    • https://s3.amazonaws.com/bisegilupuf/el_rosario_de_la_virgen_maria_domingo.pdf
    • https://uploads.strikinglycdn.com/files/c6d3490d-7d2e-49d8-b68b-ab7205f50256/jodanapulanobukuwatodufur.pdf
    • https://uploads.strikinglycdn.com/files/086f3fee-4b99-49ad-a399-20ce3a816adf/ruginupowusebalimu.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_off000111f9.bin
78c8853ea946b1def4d778d2d6b6e8e3c26ffc1b509cafafe4fb4562e42e6f06
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 5680 bytes
font_01_sfnt_off00012517.bin
616a76213ab504014262ab8c9f63761a73ee0d73537090c10c3e23481c0904a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 11036 bytes