Malicious PDF — malware analysis report

Static analysis result for SHA-256 af88ac751f688444…

MALICIOUS

PDF

71.5 KB Created: 2020-12-26 06:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: af639672f7cd07809834f591ca2522d0 SHA-1: 9196c13d117570af789c30a768ed920a36a652d0 SHA-256: af88ac751f6884449aa8b9da345d69645e4ea7f84200c60a3b77cb3788cf3b48
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=gay+science+nietzsche+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418180/normal_5fd242d49788d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_5fbd2932a2fbe.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/gdriADc/jalas.pdfIn PDF document text
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/23a29d0d0.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/tomagujaxi.pdfIn PDF document text
    • https://musopikulaw.weebly.com/uploads/1/3/4/8/134851971/welizisotofole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_5fa052526940b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f9e231c4afce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5fab050fd3dbd.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/voxipanovigepiv/babli_besharam_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebfa07a-b8bb-41fb-a730-be0d5d6a6a83/lost_river_cave_bowling_green_kentucky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98c8430-d0fd-489d-91fb-b53abcedcf8f/66218962340.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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 5068 bytes
SHA-256: e030bb1b62a1ded4d59309f2ed2dcd0b531d022efb3c0610a67cc67b3723f49c
font_01_sfnt_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 10064 bytes
SHA-256: 3e784039ceb9fe76893fd36746812ddd4aa69e429cb2e3afe3a107d20bdc2ea1