Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8f66504ebf75e3…

MALICIOUS

PDF

58.7 KB Created: 2020-11-19 02:24:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 480ebdb8f7c4ce12b787b59c58a44e4c SHA-1: d0da2946a9f054855c818374be74ace4b9757a86 SHA-256: 6d8f66504ebf75e335693efc8d3414c9b7fd178eb3bf60b31b4d6fa577b02d5c
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the `PDF_SEO_LINK_FARM` heuristic. The primary malicious URL observed is `https://traffset.ru/strik?utm_term=introductory+circuit+analysis+12th+e`. The presence of these links, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/strik?utm_term=introductory+circuit+analysis+12th+e
    • https://cdn-cms.f-static.net/uploads/4407576/normal_5faf57469a138.pdf
    • https://kilunifogewawo.weebly.com/uploads/1/3/4/4/134457757/3347945.pdf
    • https://cdn-cms.f-static.net/uploads/4378164/normal_5f8f8a5ccfdbd.pdf
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5f954172bb48a.pdf
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5faf0a4a0643c.pdf
    • https://cdn-cms.f-static.net/uploads/4482870/normal_5fabf1e2aa610.pdf
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5fa39a4266405.pdf
    • https://cdn-cms.f-static.net/uploads/4469103/normal_5fa37c56c03ce.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/pugimus.pdf
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f8a98d6a27b0.pdf
    • https://cdn-cms.f-static.net/uploads/4413590/normal_5fb52c542f429.pdf
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f889f0c0679c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xisakazelelinim/82348461367.pdf
    • https://s3.amazonaws.com/salade/taco_bell_nutritional_information.pdf
    • https://s3.amazonaws.com/gifiz/generative_adversarial_networks_projects_kailash_ahirwar.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_off0000aac1.bin
83b5cccee8227d7c982e4e1599673554584380773ff474d62c5693b24209aecc
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC1 5252 bytes
font_01_sfnt_off0000bc9d.bin
28f7d3c076d008180ae2fcd0b0c0fb10c26d8ea000608a803ea2d3e6540b94bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9D 9676 bytes