Malicious PDF — malware analysis report

Static analysis result for SHA-256 534a6c1d1351f174…

MALICIOUS

PDF

99.0 KB Created: 2021-03-20 02:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 40e200922e17202ff6fab80ec2a514fc SHA-1: e374bae9819bb23b616026ae427c313dc5d5bac1 SHA-256: 534a6c1d1351f17442d37be633b6b302ee1b729ff070d87c12e3f600f6853552
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs pointing to disposable hosting, and heuristics indicate it's a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=utilitarianism+theory+of+ethics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451356/normal_6028f1ce26a93.pdfIn PDF document text
    • http://bukivagixunok.22web.org/41764913069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_60308b1c12e28.pdfIn PDF document text
    • http://marketeuro.pro/video_x_player_download_for_windows_102z6au.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5ff9a49426a42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388833/normal_5fcaf688df1b3.pdfIn PDF document text
    • http://ins.expert/using_a_reflux_still_to_make_whiskeyx5rzf.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/ae8d78d14f.pdfIn PDF document text
    • http://premium-cinema.com/what_are_the_4_contingency_leadership_theories4q7em.pdfIn PDF document text
    • http://dmdmassage.com/48777142569n96o2.pdfIn PDF document text
    • https://wovugijewinekox.weebly.com/uploads/1/3/0/7/130739614/4669366.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/12d84a60-bbe8-4c99-8d70-83b28988616b/gelisarekebexexozome.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_3b5d51c2942a4ccba091ecfe50506275.pdf?index=trueIn PDF document text
    • http://kuwubunaxube.rf.gd/49737154771.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_531d7242680e41f48ed3792f84d89ade.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0742ac-1cb0-488f-aa06-073632c26b4c/weber_cooking_recipes.pdfIn PDF document text
    • http://kujofumuv.rf.gd/dazorafuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888b50c4-59c2-4951-a33b-e6ef4abf34d6/83894190769.pdfIn PDF document text
    • http://bijalefopate.rf.gd/74636788302.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_off0001471c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471C 5488 bytes
SHA-256: fd3123663d3608c9ce333334bbae7ef0849f3efd3ca169251d81dcbcac26e784
font_01_sfnt_off000159a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A8 10728 bytes
SHA-256: a058a5874b1a90550b560a07cc56426c015671aa4013de8ea02e59cdaec95c14

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