Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2512528169cb3de…

MALICIOUS

PDF

69.0 KB Created: 2020-11-13 03:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 072a5c38379e9f1f2e1a241f159056f6 SHA-1: 17a2c7308aa644353f0e95f76f4af189e4f8e5e8 SHA-256: d2512528169cb3de98502c42eb126b14d1e3a9662e389c3562b93e4592d7b92b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'trafffe.ru/strik', suggesting a phishing or malware distribution attempt disguised as a font download. The PDF structure also indicates a link farm, further supporting the malicious classification.

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://trafffe.ru/strik?utm_term=zawgyi+ttf+font
    • https://judunelikirolo.weebly.com/uploads/1/3/4/3/134375477/b6da7.pdf
    • https://cdn-cms.f-static.net/uploads/4377656/normal_5f89f9fa32943.pdf
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f8cb486485dd.pdf
    • https://koxokigibobov.weebly.com/uploads/1/3/4/6/134600250/8103773.pdf
    • https://cdn-cms.f-static.net/uploads/4412996/normal_5fa73b65d1ebc.pdf
    • https://xufuluzigi.weebly.com/uploads/1/3/4/2/134266078/bilivoguganaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bakoloj/wisconsin_cdl_manual_2018.pdf
    • https://uploads.strikinglycdn.com/files/dd27d119-53c4-4948-a24d-2567da54603c/65788601523.pdf
    • https://s3.amazonaws.com/wapabefizosumi/70991037950.pdf
    • https://s3.amazonaws.com/rorives/mirror_image_artifact_diaphragm.pdf
    • https://uploads.strikinglycdn.com/files/c76ca3b6-3b9a-4901-b6ca-84a6073a9bc2/sipafo.pdf
    • https://uploads.strikinglycdn.com/files/c6ff8d78-6fb0-47c2-a773-e7ae2ecfd545/24080607094.pdf
    • https://uploads.strikinglycdn.com/files/a108e696-365f-4cae-9e83-55ca1f907b57/vazavanedureboketodemeweb.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_off0000d3b8.bin
f30ce02dc578956cde4cee771834788e4fd79ce4c5a98cd3920d85752a3a8c98
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 4780 bytes
font_01_sfnt_off0000e438.bin
26be2ca59f90b72d56eb7ef8018f1a369ae468e6d62a3e5b7b35ed85c2bb6367
pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 10396 bytes