Malicious PDF — malware analysis report

Static analysis result for SHA-256 c535c1dda737fe86…

MALICIOUS

PDF

62.7 KB Created: 2020-11-25 07:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6b894a1b205fa61888bd64b86d296c56 SHA-1: 0502461cc29808aad1cd0b96c155aaa379e74ef4 SHA-256: c535c1dda737fe86120fb934ab0937626d2402b5103d9200af6dd942246b52ec
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URL, https://trafffi.ru/strik?utm_term=clairol+age+defy+medium+golden+brown, which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, appears to contain product-related text, suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafffi.ru/strik?utm_term=clairol+age+defy+medium+golden+brown PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5fa7dee90ba4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5fa6bd1157368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f892652d3190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_5f9c815ad2101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_5fa9bf28f1626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kaxukok/71602955897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2bd3b00-51f4-4ed9-8483-c62f1b933946/bowokoxiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7593257-f036-4a71-8c36-f39cf92ee8d1/horse_blanket_denier_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5f0287-a7e1-400b-81da-6057e662adb4/35420548901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc0a88d-a0d0-42f9-9904-fc95ea8eb341/3718939960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44c7697-3a81-42ee-b522-f6bbda0b5b9b/nujiwoxo.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_off0000b724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB724 5288 bytes
SHA-256: b7726c29161e99b23f64d5474b71fe5fe692d128867655d444c94b443785d43b
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 10992 bytes
SHA-256: 198d2e3f015cec7c8140ea250aa57e17964603d315e8e9f34893b2d80cc72b83