Malicious PDF — malware analysis report

Static analysis result for SHA-256 9788e779726aa6ef…

MALICIOUS

PDF

73.8 KB Created: 2020-12-29 11:24:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3b22f207aa3e395335f71be5d7e08e9 SHA-1: 0328052eff63dd5d7344933b2762eb921b728576 SHA-256: 9788e779726aa6ef938c7ed101453ba4ffcfd11bae1aa4dcb8947a3d299d558e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body's text, though partially corrupted, includes a lure related to Instagram hashtags not working, likely to entice users to click on the embedded malicious URLs.

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://trafficel.ru/strik?utm_term=follow+hashtags+on+instagram+not+working
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5fe41bdb564b7.pdf
    • https://zujolifuwumew.weebly.com/uploads/1/3/4/7/134773321/2db22558ad6.pdf
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fc06ed2ca6f9.pdf
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/diwitunidup_xisuvevig.pdf
    • https://cdn.sqhk.co/kitaparek/hshcTjj/rob_van_gameren_f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lanorolowu/lomofereganupalanekomib.pdf
    • https://uploads.strikinglycdn.com/files/a1f964af-29c8-4466-a962-4063ed2bc565/luwilasimatijopalaluruw.pdf
    • https://s3.amazonaws.com/dukavunivifa/jedak.pdf
    • https://uploads.strikinglycdn.com/files/2c176fea-475b-4cda-b01b-a7b148fb866d/wikusevekuzamoposu.pdf
    • https://s3.amazonaws.com/sitok/40724290902.pdf
    • https://uploads.strikinglycdn.com/files/5f329e87-aba0-46d1-9d0a-1d267ae4ebce/pastorela_de_8_personajes.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/17773326730.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_off0000e2a8.bin
6ad40c734255e7a55a311a89527eb4538450c3fddb2f98c1b1fb5d4eaf3aa71c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 5208 bytes
font_01_sfnt_off0000f448.bin
e7e1be47387c824d9f60b6966087930180517d94ed427a2fba7f9f88f6c72574
pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 11388 bytes