Malicious PDF — malware analysis report

Static analysis result for SHA-256 3255a9e3ba8e6dcb…

MALICIOUS

PDF

68.1 KB Created: 2020-12-19 22:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dcd605ea5557bccd3e206289205fe00e SHA-1: 0ad4b6335cf8740d671fd314d63bd60e1ac17e91 SHA-256: 3255a9e3ba8e6dcb6b3aaa2faafd09867e9a36a474a2ecb84d1ec5d626a9dac9
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://traffine.ru/strik?utm_term=women%2527s+hockey+skates+size+8 PDF link annotation
    • https://jasefukop.weebly.com/uploads/1/3/0/7/130776564/5961034.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/3c8605fb-00f1-4ab3-b93e-979ea8d85309/ue4_aim_offset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9a21c3-33c2-420c-82e7-bee32cb257fe/pesuvaxufafasowizoxososad.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/50741705800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada3e5ae-2ea7-4119-84ae-66365423827d/91496946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90e819d-e164-4497-8eaa-0e7e286775f7/vubefexixexuvejut.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/16043633265.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/latest_bollywood_songs_mr_jatt_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/damudexuvorabimedamama.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/cmos_4016_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/titesedaz.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_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 5368 bytes
SHA-256: 5644a76ccfd8d5ec91115e9b6626da7d7ebd6941a75e2508aa654a462675bff7
font_01_sfnt_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 10584 bytes
SHA-256: 3b6145e0d8eced33524f413357edcc52e08ff97f5cc7173d68e57c5fc0b9c704