Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a71c51f7a37e78…

MALICIOUS

PDF

64.8 KB Created: 2020-12-25 22:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7aee72abb7ba8c9e20c3f297468fb577 SHA-1: d3bf6c3235f25ce74d16f54fa93ece9b0ea3fad1 SHA-256: 28a71c51f7a37e78ec49f61930b7a4c9bfdb05732eeb169220a1c47498a1e840
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. One of the primary external links is to 'traffine.ru', which is often associated with malicious activity. The ClamAV detection and ML classifier also strongly indicate maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the overall structure point towards an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution.

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://traffine.ru/strik?utm_term=amaze+restaurant+in+doral
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f87183d05ad4.pdf
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/pinibaxopexurilasox.pdf
    • https://cdn-cms.f-static.net/uploads/4452595/normal_5fb518f85a819.pdf
    • https://cdn.sqhk.co/xiteduva/CIigcpn/98074299225.pdf
    • https://lafupoboj.weebly.com/uploads/1/3/1/8/131857117/9789906.pdf
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5fa55bbf68acb.pdf
    • https://cdn.sqhk.co/bumigorawi/XpjgqKA/33887056684.pdf
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/daloromuzikeki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/83cdf86b-d0a0-455e-9124-731f40dbf75d/mathematical_proofs_a_transition_to.pdf
    • https://uploads.strikinglycdn.com/files/0cfdb530-2c2a-43ff-b686-34840c481edc/jajudopoberoragi.pdf
    • https://uploads.strikinglycdn.com/files/186248f1-c8ea-4eb0-8991-d299ec48f522/38207849881.pdf
    • https://uploads.strikinglycdn.com/files/f8cf24d3-b667-4724-8aeb-c45b27fe4d52/wimax_bus_eumerator_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/bc289ce9-021a-479c-b5ce-8c91b7c39140/best_finishing_badges_2k20_for_sg.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_off0000c1e7.bin
f7392d0123b513133aa8a548c043326a4b1e618baf9b1aaf2f3113d2d7bac986
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E7 5008 bytes
font_01_sfnt_off0000d2d6.bin
aec9395426c5b977243f159a6f044a64126ffaa77dd1a020b4c03b00ba7b4f7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 10592 bytes