Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd58955c6d88f0b…

MALICIOUS

PDF

66.2 KB Created: 2020-11-20 07:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bd9af51623af75665a0bee1249e76fb4 SHA-1: db78d63c0258d278f097a04b62c89e93964ab208 SHA-256: 9cd58955c6d88f0b6473974f0616a9faa9cacd7f649182575b2d16cc79d7c8ba
156 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The primary malicious URL identified is 'https://trafffe.ru/strik?utm_term=instant+lifting+serum', which is likely used to host a phishing page or distribute further malware. The document body, though heavily obfuscated, suggests a lure related to a cosmetic product.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=instant+lifting+serum PDF link annotation
    • https://sigodujirole.weebly.com/uploads/1/3/4/3/134319969/3412420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_5fa2d5bb47ec2.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/duledixefubo.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/mareminijagux-kowuxatulebelo-rupubimotupin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_5f9be32a3c2f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0717738c-fa47-45f0-b72e-4151caa7dbab/41678543883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82957a9-a337-4106-8d70-90d884cb17ee/16073378934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904356fd-bd3d-4065-97ee-f1af4c52d59d/moxuzeguki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b6b404-fd88-487f-b470-151b169a278d/dabekuvumoxuvimifo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC551 5024 bytes
SHA-256: 7fb64d41d65097f9b9d0bad4a0ef61fa5e86c7701dc84384fe2f9871b33ac623
font_01_sfnt_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 11652 bytes
SHA-256: 9f616f6f40fa57dec09bd206b07e107237fcdece9788a0105d3229caa120307a