Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d8fd85cfbcde37…

MALICIOUS

PDF

68.4 KB Created: 2021-09-09 10:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 431dd6fb6ff16eb13037c0cd900813e8 SHA-1: dae96dd4431ec767e5b4de00b66adc178eb8959d SHA-256: 82d8fd85cfbcde37e93a1ef40e896d62d85cdb625f2117e0102dfe22096b7f9c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=mail+href+html PDF link annotation
    • http://smsgurugram.com/miet/assets/files/51192658051.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/66775894368.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/88917603758.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/65247881131.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/72357188654.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61394FF818AD7.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/jexibexisapovufekuxizezas.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/runojolifobefawubanusotik.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/mepenudavuneji.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/35191015160.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/89326858000.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/mobavovutizalalisaxaxa.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/39539923364.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/58935288685.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393abc4a6f8---tefunexamona.pdfIn PDF document text
    • http://dsraxys.com/uploads/66680541871.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/fixovetidapogib.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/75684019776.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/tufig.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210906_41ACDCD80210550E.pdfIn PDF document text
    • http://mobiliteit.nu/files/gijujemeni.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613090da3ab1c---87874599264.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/mutudaladisi.pdfIn PDF document text
    • https://ms2oke.com/contents/files/puvifilakapazajagibi.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_off0000b0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D9 14784 bytes
SHA-256: c942f0304194827d640c932ee194d744bfee6055b8c6448f9b62ca7109c0753a
font_01_sfnt_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10080 bytes
SHA-256: e46dd79aa59f89c4b20ec28e67e66925d783a3d02e907fa30297ee8ad97fb13a

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