Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46d8a4a2a2d0044…

MALICIOUS

PDF

68.7 KB Created: 2020-11-21 02:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 48167b242e67272112265db6db1faf04 SHA-1: 93b5e006e24e4c9376dc7e68dc6e6d51ebce3e1f SHA-256: b46d8a4a2a2d00442bbdb17e791437bdaf7ac5a595907bcf4346df4ab984aeff
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were directly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware distribution scheme.

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://trafftec.ru/123?utm_term=rct+classic+apk+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417226/normal_5fb2b03d1a218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5f9c9e77cce3e.pdfIn PDF document text
    • https://vajigapevinukaz.weebly.com/uploads/1/3/4/5/134578345/rizigov_wufekagoxedafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5fa5c725d3205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_5f8be1e7b3c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5f93d52e184a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5fa1bcd29fd70.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/87aff592-b8e9-49e9-9920-07136c2262a8/zutepogit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5648e1b4-e65d-48b4-944b-536b0ace997d/solving_systems_with_matrices_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/35457101134.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/34046157200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5ed34b-6fbd-4446-82c6-cab20151771c/husqvarna_yth2348_user_manual.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_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 5196 bytes
SHA-256: 690cfe4ee7ad631efdc1b64c7914e6102dd7bf0881bcaef0b87be0b4fa4a845b
font_01_sfnt_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 12536 bytes
SHA-256: 8eef6b2843df284e8b0a78adb6b88903c0504919bd3701d85cd3a106a91337f2

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