Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f2dc466b3aed38…

MALICIOUS

PDF

74.5 KB Created: 2020-11-22 08:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: df0930028ccc0c18f6fd4987ef8e490a SHA-1: 1f6266a40377ae4d58e32bcaa120b521c60fcdfb SHA-256: a9f2dc466b3aed38ad79bac0a9ff1205003a354aeeb70c6879bf9023892c4541
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 0.9998

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/123?utm_term=civitavecchia+to+rome+express+train PDF link annotation
    • https://munadixozobud.weebly.com/uploads/1/3/4/6/134635459/sipozo.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/fodevezewipozofidepa.pdfIn PDF document text
    • https://tuvozejuwubox.weebly.com/uploads/1/3/4/3/134323710/e83d99.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/wujapu/create_a_dna_fingerprint_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61bd098-f957-48fb-abb7-bd7964aeb93d/kibeponijakimozarigorew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdbf586f-5930-4716-86d1-05e5d6b61c71/sipovajeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fc26e2-7a0e-4795-a8ca-998abcd045d1/the_secret_circle_temptation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d035e10-e97e-4bd2-b67f-c1e69778b9c0/agile_methodology_free_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/46459957952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97640a6e-7a17-47db-9412-009dabf1be15/call_of_duty_black_ops_multiplayer_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca33e29-0706-4eef-aef2-a9a54e355f90/15542239645.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_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 5176 bytes
SHA-256: c131972c488bbceee9fc4ada0e2348aa1d4ed69fd90361610d0e6608351c9c8c
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10736 bytes
SHA-256: 650d4a41393573aa21257844163809a0c3470ffbf4ae8d4cd1bc3abe5a396ef6