Malicious PDF — malware analysis report

Static analysis result for SHA-256 93eb370c2a1a0a94…

MALICIOUS

PDF

67.2 KB Created: 2020-12-14 02:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4d6cdcbc926ae29fe3ccd7748accba32 SHA-1: b41e3d1e5988e70424b2f1c84e16388269eeaf73 SHA-256: 93eb370c2a1a0a94edcff0cd5a02cfb5ebb7ee3d25b13846017d1fedf3563c96
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, with one pointing to 'https://trafffi.ru/aws?utm_term=color+para+whatsapp+android'. The ML classifier and ClamAV also flagged this PDF as malicious. The presence of embedded URLs suggests an attempt to redirect users to potentially harmful sites, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/aws?utm_term=color+para+whatsapp+android PDF link annotation
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/5a517e18f81e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5fcdb657a0509.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/032a148f-e8ec-4748-93c4-9e14f175a1d2/kiwujuxokefijavaduvibaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2048e183-1ae0-42ba-91b6-22801f1a7210/gafamuworirawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add6d4d7-fede-4ff1-99f0-ddb35f47e8c9/dezafarezixuluwused.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/aristotle_poetics.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/61492809183.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/envisioning_information_edward_r._tufte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc340d2-441c-41fb-8fd0-2d65be065013/34429243368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d947b3e6-f7d0-4a17-88bf-d771349a412b/vilojub.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_off0000cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 5044 bytes
SHA-256: 24d095346297639441896803e632bb7f67a878db41150358cb5d8201dacd1643
font_01_sfnt_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 10188 bytes
SHA-256: 1e86767811604d59352836148b97e714da2b7cf3bf7428874553e2f5c3f10fc5