Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4134fef780ba35…

MALICIOUS

PDF

73.7 KB Created: 2020-11-13 06:24:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb268f06ba0e25e53a6882fca626b383 SHA-1: 295cddb523a6ea290ef22e14f1e8bf89e5613918 SHA-256: 0d4134fef780ba35bb4d551539ed5da87819836927d122e3f45203772e0e5d46
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL leading to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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/123?utm_term=constitution+study+guide+pdf
    • https://xugojegisonixen.weebly.com/uploads/1/3/4/6/134684264/3490695.pdf
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/kopigudipagusobalo.pdf
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/depamawo.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdf
    • https://fisofomopix.weebly.com/uploads/1/3/4/6/134603918/9851492.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/51a4a6bf-8242-4c5c-ba96-a94029038a9d/womumupofob.pdf
    • https://uploads.strikinglycdn.com/files/e8b78658-7561-44b3-8fd5-01e2978cb61b/newstar_diana_blog.pdf
    • https://uploads.strikinglycdn.com/files/c06a16fd-9fcd-4549-9d4f-537f1649e76f/gustavo_lima_balada_indir.pdf
    • https://uploads.strikinglycdn.com/files/1849e9dd-bbb8-4cc0-908d-fe1f23fd2cc3/lisa_nichols_abundance_now_audiobook.pdf
    • https://s3.amazonaws.com/felasorarabipis/math_logic_symbols.pdf
    • https://uploads.strikinglycdn.com/files/10960602-cc09-48d2-bf62-840430e9a3ca/rolenimumeturenako.pdf
    • https://s3.amazonaws.com/wiwamoxamo/97891178029.pdf
    • https://uploads.strikinglycdn.com/files/594c8a57-ebe7-4f53-8191-9b628c323428/mystic_equipment_guide_black_desert_online.pdf
    • https://uploads.strikinglycdn.com/files/1e972261-28e8-4915-bed2-ae87cd18f1bb/how_long_is_bptc_valid.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_off0000e4d0.bin
4e0c725e309242d559efa1fbef41692bd4c1972285abdd4acca35a155575702d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 4876 bytes
font_01_sfnt_off0000f58f.bin
c558e992c94a2d25a5cd3d27a27c760a2ed9803679f8d67c6f8b24d98ba6746a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 10644 bytes