Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a9e3984ac6f3e8…

MALICIOUS

PDF

96.3 KB Created: 2020-11-14 09:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b160e1ea5db32bdad4ff0c614eb51b74 SHA-1: 6924bd6b8a4f8f35af0980e0c153af4d0aba9b5f SHA-256: 36a9e3984ac6f3e8630bfbbc83f423ee8a55370af91d5d359ef747e62fc747a0
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the external links, 'https://trafftec.ru/123?utm_term=giao+phan+xuan+loc', is directly embedded and flagged as suspicious. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of embedded links and the heuristic firings suggest a phishing or malicious redirection attempt.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=giao+phan+xuan+loc
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5fa5df4e41ece.pdf
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f8f7a729f2ce.pdf
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5faf5153f13c4.pdf
    • https://dirojobadenanew.weebly.com/uploads/1/3/4/1/134109317/60cc330b06235.pdf
    • https://cdn-cms.f-static.net/uploads/4409238/normal_5f96f113422fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/43682788-a94f-4578-a697-13a6824ffab1/vitruvius_on_architecture.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/beyond_the_diet_meal_plans.pdf
    • https://s3.amazonaws.com/libowebujakux/collar_t_shirt_template_png.pdf
    • https://s3.amazonaws.com/zetare/rig_veda_sandhyavandanam_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/91db6e34-e58d-40f0-9247-742f80d872cb/79079322636.pdf
    • https://s3.amazonaws.com/jexijer/jio_4g_voice_call_app_for_pc.pdf
    • https://uploads.strikinglycdn.com/files/f39f9df1-3fee-4ee2-8582-dee4449bb122/nolijekixefixarida.pdf
    • https://uploads.strikinglycdn.com/files/1584ddb6-d869-42a9-9be6-ddedf1c6e117/kukowaliragedujogowiz.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_off00012fc8.bin
bb30ada095ac9efb3f6d875ae0d32770850536bbafc21625a8ec3d13d25f92b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 4848 bytes
font_01_sfnt_off0001404e.bin
43a0fb4a641ea281fde77f35f3112f5f9328e7a98a5588b13125d8753d8f2423
pdf-font-stream PDF embedded font (sfnt) at offset 0x1404E 23708 bytes