Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dd302d164a38dd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 14:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 86eed7ceb535d7e76dcc150d8e453c4c SHA-1: ae37dea9919f299de38337e7fcd6d83880dba391 SHA-256: d8dd302d164a38dd5351346f9f95c657ddc78305205e7ae148d5652b7a20e9d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=grob%27s+basic+electronics+solution+manual PDF link annotation
    • http://hebakotb.net/userfiles/file/53879960303.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/safisumomidifabizukatigi.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/piguwukaxutitoforax.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/75212332016.pdfIn PDF document text
    • https://ms2oke.com/contents/files/fuzak.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/favugitiwe.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/46175174941.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/loforixetakumurebiwalav.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/pebimulusobisapavinu.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/48263850685.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/fesivoxoga.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/89354817016.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/54224838882.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/7869933142.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/xagotobozinukebiminanut.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/zoxixenidexulofizun.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/jinewopalatitawu.pdfIn PDF document text
    • http://packamate.com/userfiles/41191395688.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/fubipawutuleduwixoveb.pdfIn PDF document text
    • http://apsons.eu/files/file/wixonavezebedixikozetovum.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613515aa53792---wanofirukimononataxesad.pdfIn PDF document text
    • http://licausi.it/userfiles/files/52060331186.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_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 18684 bytes
SHA-256: 507193548a9aedb97393c39fc737329d1a291559caa5bb3a8f14e90494c11c1e
font_01_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 10704 bytes
SHA-256: 324340ca0d2e1b76b7b443a1f6e575aca19559ef7d3bc819ef5cd7419fa9f3cb
font_02_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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