Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b477358c6bbb932…

MALICIOUS

PDF

70.2 KB Created: 2020-11-10 11:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0d4318ad0f66ddd2f9871462218b40b9 SHA-1: e5ad8ea94d77520db38f3ee194c77c20e8188597 SHA-256: 0b477358c6bbb932d6c3d7886b1be5bb637408ba873f04577660e2142bd294a7
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of a 'download' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to redirect users to potentially harmful content or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=mario+theme+song+easy+piano+sheet+music PDF link annotation
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/gewupefamesuba.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/matuwaduwuvibad.pdfIn PDF document text
    • https://zerexiborugixa.weebly.com/uploads/1/3/4/7/134705556/tinisuse_tobuvotibodoxa_mofus_kofeb.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/67fce.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/pevov.pdfIn PDF document text
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/kodiv.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/e15f111a1112.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/tifuwuw/41330645121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1943a37-e0c3-4b66-af73-a92f058ed2ba/jh_news_and_guide_classifieds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a794b7-0eb9-4dda-be70-132ec33370aa/frigidaire_gallery_dishwasher_fgid24.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85334746-0c42-4589-ad8a-dc1789ba90c6/cartas_a_um_jovem_investidor.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_off0000cbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 5420 bytes
SHA-256: 8116d7153fdb19325f1d2ed6eef83c1b286d0bf2f83f6efa109d95a53558a1a5
font_01_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 13380 bytes
SHA-256: cfb0bbf9807028dcb9336c74eeff2306337a168afa9fa9015e0cafaf68667cc5

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