Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f86f823a76ec6f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 21:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b0e06def01222d2645d1263551803d94 SHA-1: ca2dfa21455af2ffabd76318bf4d82e737a91281 SHA-256: f3f86f823a76ec6f805e21f277f5588419709bb2eb061763da0625fb19636712
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=identifying+ionic+%26+covalent+bonds+worksheet+answers PDF link annotation
    • https://epiphanych.com/images/file/dugop.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/vapekidukulepolizelanef.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/83473754233.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/51564811984.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82373055374.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/18587534454.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/37776580401.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/94688266725.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613222cedf76e---safomojon.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389c0de2765---nebajixonotat.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/detifuxazisawewejik.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/32718116969.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210905183119_yx1fg8.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/85217176004.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/68861983192.pdfIn PDF document text
    • http://doluhosting.com/calisma2/files/uploads/gesozukokewujenebapig.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/35045501774.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/sufolidusu.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/55015250205.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/45107416873.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 10240 bytes
SHA-256: 7e030a0ac173454e8bc8a7c5d285c33c11c1597790e7935664e4e0965ba24124
font_02_sfnt_off000116fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 17412 bytes
SHA-256: a5d2d6741216d82a1412942690657783ebda713ecc598842de2f9124514d2dd6

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