Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f25cb4feeceda25…

MALICIOUS

PDF

73.7 KB Created: 2021-04-06 16:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f091baa8458016fa8221983d4cd5a992 SHA-1: cc08ce65e877e8d80b79c9361a03846f1e04193c SHA-256: 8f25cb4feeceda2525285b991dfaf9d5ea8d0914bee453b7419d4acd17bea20d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious PDF, likely used for phishing 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://xajibur.ru/123?utm_term=allied+telesyn+fs708+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fc5c9dc1c11a.pdfIn PDF document text
    • http://life-news.tech/2017_jeep_patriot_owners_manual1l48a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_605f69e6366bc.pdfIn PDF document text
    • http://soldonlakewood.com/rumujalawaplrcz0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6019a1b07385f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_6018a2f265f46.pdfIn PDF document text
    • http://zarabatyivat.ru/9315968340le9bn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5ff3d70ce3527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_605bc0af1ae89.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/72_angels_of_magick.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/55431476164.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://linza.media/what_is_tp_link_default_ipnd3ur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_6042dc50ae507.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/ponivotigegepub/19387392093.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/wynk_music_app_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/549feb22-811d-4a0e-972c-c4c6e3b26055/xapetaretevedobufan.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/4690499543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba081d5-ece2-47da-a161-5d73275615aa/31456414824.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/fowurafutinenolu.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_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 5464 bytes
SHA-256: 8e9aa68675bcf227634a00810ecaabca5a2f296c41159d85d662a600f2a590b5
font_01_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 11124 bytes
SHA-256: 501694d42462c27dfa252dcb82f61b3863bba42f2d4a885cd4ea2b8e2ee5399e

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