Malicious PDF — malware analysis report

Static analysis result for SHA-256 6486e395ee08ffa9…

MALICIOUS

PDF

70.4 KB Created: 2020-11-12 23:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1df790445d32e10df841ca75a58bb50 SHA-1: bae49fb690ee9ba436c3cb1e60556a7dd187c86f SHA-256: 6486e395ee08ffa973a4fdef52d329e72aab4510d79fe58f112f4e56eb9891c1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/strik?utm_term=organic+chemistry+all+reactions+list
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/3821250.pdf
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/rebujiteg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/72dc6eec-6921-4d21-9624-8d966002e2a1/46068718217.pdf
    • https://uploads.strikinglycdn.com/files/085ae71d-f922-4bfe-b008-3fc34969fc42/novixamobodakavuw.pdf
    • https://s3.amazonaws.com/nemafu/ernest_rutherford_gold_foil_experiment_date.pdf
    • https://uploads.strikinglycdn.com/files/742826a3-7ab6-4338-b51c-0d67bc1afd43/zunedobiwefubenetenu.pdf
    • https://uploads.strikinglycdn.com/files/a588fd08-2ff8-422c-aa04-cd3ad6a36d1b/79895214810.pdf
    • https://s3.amazonaws.com/lezopobigeza/82423972298.pdf
    • https://s3.amazonaws.com/wizuluworafid/gejupixi.pdf
    • https://s3.amazonaws.com/vavabi/25672478853.pdf
    • https://s3.amazonaws.com/fajixe/94068643801.pdf
    • https://uploads.strikinglycdn.com/files/bc79c759-b0f2-4b4f-9e98-7aff9216e3f1/zupukoluvexipirurusa.pdf
    • https://s3.amazonaws.com/zidosozawok/95373103466.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_off0000d77c.bin
6b197dcfbf34fbc622a5f7caf3de9da4f0b664a14d5a8be75169ac2bc5599bb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 5340 bytes
font_01_sfnt_off0000e984.bin
a1678191bd67f5a166c3ea6e310d74fa3023b8cbf74d6a6ab97a1348b339ef26
pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 10692 bytes