Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01f75cf9dc27754…

MALICIOUS

PDF

71.7 KB Created: 2021-02-25 15:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4cffd066464620a4e8bf62052722d7e9 SHA-1: 1511673014e3ec7caa153a3e5edd44985754dac0 SHA-256: f01f75cf9dc277549440d0eaa0333aec6b477c828bb2a46e59be03cdf140107b
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wb?keyword=stephen%20hawking%20books%20in%20spanish PDF link annotation
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/31144594eda284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369506/normal_5ffdbd95769be.pdfIn PDF document text
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/tujifejosetuxufa.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/jQHhhja/zopiwewidobuwasebolete.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/98453267736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_5fd1d0d39affa.pdfIn PDF document text
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/a7006905c1.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/vexuxisegexevof.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/dunkin_donuts_vanilla_bean_iced_coffee_recipe.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/xulinogafemujutivik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/the_golden_goblet_chapter_1.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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 5352 bytes
SHA-256: e59aec4382402a37b5760f7ee6245bac11df2f5c8c0e6e516becd79bec7a6f94
font_01_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 10756 bytes
SHA-256: 0d4cd7bf0f9d46884982e634e3b5629a228f9575760b16864cd33fee8bf0cb71

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