Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a3aa5ea827e584…

MALICIOUS

PDF

87.8 KB Created: 2020-11-29 03:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86d00fe7ce1a7fb3d1f10bce204fbc51 SHA-1: 5a83a0ada0a72459562db9c247a0be487b2d9f97 SHA-256: c1a3aa5ea827e5842c285c82a518b9fef03387dc8a77c7d3bcc1c8666725f865
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'traffnew.ru', which is suspicious. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution 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-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://traffnew.ru/123?utm_term=david+yurman+crossover+ring+gold
    • https://cdn-cms.f-static.net/uploads/4448113/normal_5f9ea791eb0b7.pdf
    • https://gurivarux.weebly.com/uploads/1/3/4/3/134309953/6fb620e.pdf
    • https://fofupapezu.weebly.com/uploads/1/3/4/3/134356394/xolaz.pdf
    • https://cdn-cms.f-static.net/uploads/4459625/normal_5fab402d3bf8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/599fe3ea-25ae-43e6-887d-b5220d5f4e56/xubakepiwatilebolapevu.pdf
    • https://uploads.strikinglycdn.com/files/8ef85a48-199a-4662-af1b-fe693d6add22/stephen_king_night_shift_story.pdf
    • https://uploads.strikinglycdn.com/files/d4c9f1c0-9efb-4f50-9423-c3703292f660/kekogowujoji.pdf
    • https://uploads.strikinglycdn.com/files/0e9ca230-53b2-4b1f-bd2a-d12183f1b7bc/zedafokenovef.pdf
    • https://uploads.strikinglycdn.com/files/16bbf6e5-8119-4a8a-82e1-d0763f774714/31320547894.pdf
    • https://uploads.strikinglycdn.com/files/8407331a-88a3-4766-9543-e261817467ab/ipod_shuffle_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/07a7ed30-a065-4c31-9c06-7fe6b5dffe16/12754282684.pdf
    • https://uploads.strikinglycdn.com/files/ab0836b5-b8e2-4b23-9116-d74b38399134/geruxupidur.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_off00011abb.bin
d73bc636b9f373036a80666c6dc935f5b69ec55db2f619e4f47f41b7f2e184fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 5420 bytes
font_01_sfnt_off00012d26.bin
c3e5d2228227c68e5b05cfa7561f27074996fbcaa493286d40e4e083afffb632
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 10960 bytes