Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d13d0bcccdd4f5…

MALICIOUS

PDF

66.9 KB Created: 2020-11-20 02:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29eda7a289a8781d6bd95a4ab88522f6 SHA-1: 76b648ed7ae044a42fb51cbb91293fdba4634631 SHA-256: f8d13d0bcccdd4f5a1632a346396a25e713aaee8dde8d4caf2c53b3bbc8de7e3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing lures. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one prominent example being a link to a potentially malicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://trafffe.ru/aws?utm_term=saaho+telugu+video+songs
    • https://gusilurilusod.weebly.com/uploads/1/3/4/4/134480619/lenonufavaxugub.pdf
    • https://cdn-cms.f-static.net/uploads/4371807/normal_5f8a1e36714e0.pdf
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f9a2ebdcd549.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dujepav/suxidenozekozadamibi.pdf
    • https://uploads.strikinglycdn.com/files/9bc1cbd4-25a9-4423-a0e0-ce32e6af5413/antique_fishing_lures_values.pdf
    • https://uploads.strikinglycdn.com/files/d7b50b5e-211a-4469-bc54-bb341388c565/zesowowopegojomo.pdf
    • https://uploads.strikinglycdn.com/files/2cf80500-e5dd-476b-bf3e-4fd47868a176/14943005968.pdf
    • https://uploads.strikinglycdn.com/files/0ce4ee33-f769-4d4e-a231-01bb68006577/mean_median_mode_worksheets_grade_6.pdf
    • https://uploads.strikinglycdn.com/files/f1060ed4-a57b-4379-afe1-e8ee52ffc25b/how_to_make_a_voodoo_doll_to_control_someone.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_off0000c742.bin
3acbc622c372fc676038f126eb66e4038a7e7bdf7b153385385552cd7f99e954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC742 5152 bytes
font_01_sfnt_off0000d8cc.bin
852969159d23053e88767a6be0e86ed7f5bb50853871f03112d5f3a65c76774b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 11320 bytes

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