Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfbdd0da44a0b0b…

MALICIOUS

PDF

64.0 KB Created: 2020-12-20 04:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a864a824c31c642c8618f607a8c7130f SHA-1: 529a889784a2c078d9341cd14a62f1f707f9428a SHA-256: bdfbdd0da44a0b0b6a7f20947ccdff9ab058afb34d5f13d59f27126d38bef8bc
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the malicious intent through a large number of links on low-reputation hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=anemia+falciforme+protege+contra+malaria PDF link annotation
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/zodedo.pdfIn PDF document text
    • https://gejeximiba.weebly.com/uploads/1/3/4/8/134897602/lelebusejupes_kopoxow.pdfIn PDF document text
    • https://vifomamup.weebly.com/uploads/1/3/1/1/131163898/7214789.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/98b0cf52b0e.pdfIn PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/5837576.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/temojo.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/8404455.pdfIn PDF document text
    • https://bosesabefo.weebly.com/uploads/1/3/4/3/134362720/9370155.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/67c08386-0635-421a-832f-22ad75261d1f/cars_the_video_game_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603049c8-a7f0-4cdb-8de0-541ddf134496/pumukovu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2bd98403f5353fda1b0ca/t/5fcc455a3ff1011540e52e41/1607222620481/free_bubbles_svg_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4988568b-a755-41c4-9c98-46520c732204/20236904538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f14806-5385-4ac9-87a2-4ee6d570152e/62003203600.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f7235687f52b6b817f64/t/5fcf71fc3fa051062b48169c/1607430653405/vanagekexalaneto.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_off0000bf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF50 5148 bytes
SHA-256: c020b2c78e12d4b5f35d32995dfaba5f4d9f8de28105fabfa4c50f1ab3bb227f
font_01_sfnt_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 10108 bytes
SHA-256: f2ce4cda6c585730ac17c169d93619d942c6ffd95ac8b276a0e56bed53ef8edc

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