Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc066ea384b517c6…

MALICIOUS

PDF

74.1 KB Created: 2021-01-08 17:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f3d79e4c751c822e76eff1c99156b1c SHA-1: 77a1f9828bd4f58b04c127261ffb80021696d1bc SHA-256: dc066ea384b517c627c5973403315551ad3fc71e5cd84e1c670041bb26bf6ba4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one pointing to 'trafffe.ru', which is indicative of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of links were embedded, likely to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing.

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://trafffe.ru/aws?utm_term=baby+alive+doll+food+template
    • https://mipupupomekux.weebly.com/uploads/1/3/2/7/132712043/381398.pdf
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fd1d48ad4a11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d815fe4e-64f2-4b87-9cba-c0e45e11e0e1/borderlands_2_black_hole.pdf
    • https://s3.amazonaws.com/tesodagiwor/17292574128.pdf
    • https://uploads.strikinglycdn.com/files/73648237-9b96-480f-95ff-4c4513ee72e4/41046372175.pdf
    • https://uploads.strikinglycdn.com/files/b7f9fce2-6c2d-4a05-a3cd-e075ccf2a97b/59971120334.pdf
    • https://uploads.strikinglycdn.com/files/f83a88b0-b2a2-428d-9ce6-a223aba30a46/lemadagunamore.pdf
    • https://uploads.strikinglycdn.com/files/769b3c09-eede-4839-8497-dd887420a042/vebidexisesonopudeneko.pdf
    • https://uploads.strikinglycdn.com/files/d82b0c78-56c7-4a2b-81f0-0d688004d58e/39583238118.pdf
    • https://uploads.strikinglycdn.com/files/797a2c3d-9a06-43c2-bc0f-88311507cd18/brian_tracy_eat_that_frog.pdf
    • https://uploads.strikinglycdn.com/files/670dd920-aa88-4cec-97f8-ad84c12dc717/the_social_animal_11th_edition.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_off0000e642.bin
0205d3d8b2091d466552496e065f2ea0a2112208e68b48f4c22ee982bb8b9315
pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 5264 bytes
font_01_sfnt_off0000f82a.bin
efa09b3c640854f1dc8a3629c84cf6ee22b7c34a6efb57ff6f3f34c039ce6203
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 10768 bytes