Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d808a5d87c469a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 21:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5bb9cb5e0487eb04ae193dc90ee303c SHA-1: 39859b5e27835fc65d62b4b29267820a2372c20e SHA-256: b0d808a5d87c469a856ead30c0d857ad17b256b39cea6c1f4e9739476ad7f4a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, though many are marked benign, suggest an intent to redirect users to potentially malicious sites. The PDF structure and content, while heavily obfuscated, are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://rovetco.com/userfiles/file/34896686469.pdf In PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/zamubule.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f6903dc2fc3782d3bb8397edee168447/58148496290.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/78055090192.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/gefipovokaxi.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/07/file/20210907_052351_200.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/rusisujef.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/80119853047.pdfIn PDF document text
    • https://tcremich.lu/files/files/66889456396.pdfIn PDF document text
    • https://huanghecables.com/d/files/mofovibekiwo.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/52092442269.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/47650274262.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/92875226327.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/lewenukalujoruxiruv.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/78332032909.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/legozoraguxutu.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109140524395232.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/narowewuwoguzuredizute.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/62006584903.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/99543625957.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/dugudonikusegagukefavul.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/fumatemevexojid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=st+joseph%27s+physicians+north+medicalPDF link annotation
    • 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_off0000c17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17A 17052 bytes
SHA-256: e10dc1d3831d9f075c0e1e72461017faa3a9b38dfe34f5a945444004b5ab3860
font_01_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 11132 bytes
SHA-256: b45c02205292e5a3c7cae26398f4120cc4b6f847e0f3960579d3e0ae66f36112

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