Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c8a2f649aeecda…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 18:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f746ffe37f4e5c01385b2bca2dac83b SHA-1: a3b5f15928bac7c22a94d7a762d1338729886fde SHA-256: 85c8a2f649aeecda6494bb127756a90dd1e6a35caa0d9ab7a2f880918d3c67cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is structured as a link farm, with many distinct hosts each hosting a single PDF. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=a+pi+bond+is PDF link annotation
    • https://htchninc.com/d/files/nonubafa.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/kusajo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/80665574272.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/fedelimebuw.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630888643.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/kudovudogalaxa.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb2faee46a---6960016662.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/tigor.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d03db982b6cb590f90ab2a91b3639a38/nisevekizegutevol.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/gopokivubikalajoz.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/nefozirivumopunireweropi.pdfIn PDF document text
    • http://ranch.pl/files/file/jabupetudivararepuwolube.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/70542966023.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/dotajulapop.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/nenisegiferewudig.pdfIn PDF document text
    • http://3sdent.com/upload/files/24311883021.pdfIn PDF document text
    • https://yellowstonewildlife.com/62558996500.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/zurokogejasikivisig.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/37991263950.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/13569879866.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/lavilamipuba.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/safezojovoves.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/46801213575.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_off0000c1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C3 9968 bytes
SHA-256: 8a548fc63c14f9fea438f3abacb798e5bbd32dbe7b8e8788d4172221df679967
font_01_sfnt_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 17752 bytes
SHA-256: 28ed1f62c004d3258138b61596f323ed9e37c0cf0cdb1fcc1702e39063801ed1

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