Malicious PDF — malware analysis report

Static analysis result for SHA-256 8171acb9bc618f3a…

MALICIOUS

PDF

64.1 KB Created: 2021-01-14 20:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 11b56f891472acceed6ec102d479c532 SHA-1: e96ba064c5b5a5f1f0568de9b77bffa24c1e362f SHA-256: 8171acb9bc618f3a4ce4248773b6e21f626911fe37947a65c661ff24472f95d1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URLs, 'https://trafficel.ru/123?utm_term=just+hear+those+sleigh+bells+jingling+lyrics', suggests a potential phishing or content-luring scheme. While no scripts were explicitly extracted, the presence of external links and the 'Pdf.Phishing.Trojan' detection point towards an attack pattern involving redirection to malicious sites.

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://trafficel.ru/123?utm_term=just+hear+those+sleigh+bells+jingling+lyrics PDF link annotation
    • https://soxokememomoj.weebly.com/uploads/1/3/1/4/131438280/c9554.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/3p0hW1D/earthquake_today_near_me_twitter.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/sisaxu/limadekubolipetilofijo.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/disney_nightmare_before_christmas_pumpkin_template.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/pacman_classic_arcade_game.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/82285804760.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/zirukisototu.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/fixed_asset_investment_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/mamogekupigoxok.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/simple_presentation_template_latex.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/pagumagemalikurorewala.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/73665251837.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/kitejoxed.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/contacts_from_icloud_to_iphone_5.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE06 5368 bytes
SHA-256: 467bc28abfd235d32675d3b2a34e933b8e4d2c3c33aa217f100a36988a9eee41
font_01_sfnt_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 10528 bytes
SHA-256: c90796ddc775a6c38415a31a588db83e9dba3abf65fe2215761a9dd118ddac00

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