Malicious PDF — malware analysis report

Static analysis result for SHA-256 339d2a01ff3fc93e…

MALICIOUS

PDF

67.4 KB Created: 2020-11-20 08:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dabf00df09c2a3ef84743a5e6a51ba17 SHA-1: ba543f5bad1fb4c7943f8226756b5488a3574981 SHA-256: 339d2a01ff3fc93eba312fb99b00aa68ddf10511362ff2cff028a290088460eb
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 0.9998

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 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://traffset.ru/strik?utm_term=jquery+for+asp+net+developers+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5f928903e9f10.pdfIn PDF document text
    • https://mikezopa.weebly.com/uploads/1/3/4/3/134366842/puxovimez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_5fb4033cb28cd.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/lekov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407777/normal_5f94505f7dea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5fb35ded87e59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_5fb70356cd8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_5fb3c798b4f63.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/297604.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farowug/chaim_potok_my_name_is_asher_lev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/069e0fd2-9c8a-4104-bcb2-b2b11fc5794e/zasunuvezibap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d3fed9-442e-4ab3-8dd5-052d0c7e4419/10624872500.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_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 5404 bytes
SHA-256: 4e604cbe4780122a551eba5096207e1cbcc64db52c1f58daedadf738e7f1968f
font_01_sfnt_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 10280 bytes
SHA-256: 1af587cb6724629dc0a35ae12920b2f497bd38ec426804da0c2c47c98bcbce9e