Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1683f95dd7c73d…

MALICIOUS

PDF

78.1 KB Created: 2021-03-09 01:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dd04a85c2d8c83ba60d6634ab9d3888a SHA-1: 44ac0592ab41dab434f866878fe68d850fe905fa SHA-256: fe1683f95dd7c73df4282e7c6f941cdfb878366c10d0efceb5b9ec5467ab51ae
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external links, with one prominent URL pointing to a domain associated with potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to downloading a specific guide, suggesting a phishing or credential harvesting attempt.

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://xajibur.ru/award?keyword=sanford+guide+to+antimicrobial+therapy+2020+pdf+download PDF link annotation
    • http://veruvipavopa.getenjoyment.net/wexusewipibamaxiv.pdfIn PDF document text
    • http://zozagemidifisep.22web.org/dirurozapifuj.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/5zqvJie/kitiwopurireriref.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/rL6YEjj/bird_lifespan_eastern.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_602f7a4ad121a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485308/normal_5fe95239c1f21.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/printer_brother_mfc-490cw_wireless.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/iaLiihf/62661270296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496607/normal_601b50ce41441.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/f4bf2a3a-8a39-435c-95e5-eb67b6628622/83609858422.pdfIn PDF document text
    • http://jirudef.epizy.com/what_star_is_like_the_sun.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_9be94aabcd9f47539bb9d48d0e97ea94.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c310d5-f23e-4bfd-9a24-6e1400490d42/how_do_i_know_if_my_processor_is_compatible_with_my_motherboard.pdfIn PDF document text
    • http://fuwotatikiluwa.epizy.com/15471841832.pdfIn PDF document text
    • http://zexiditakobo.rf.gd/academic_cv_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a90fa7-b044-4b86-856d-df6fa6561242/talisovinide.pdfIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_ba03fbbfb95a49b18808216edc534b4a.pdf?index=trueIn 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_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 6100 bytes
SHA-256: 74b9bcc87f647397ae914ace9082b700edcd7952b2548de48a0cfa056be6998d
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 10160 bytes
SHA-256: 39a386fa286761049c09df078cd6e260b23ecffb503156cdda3abd64a3debf4c

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