Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af9b6a76ad39101…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 05:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d30d974a3ebec2fd133f8b7e7af08813 SHA-1: 4a1b2ee7b208625befab6e76c62f097de7814372 SHA-256: 6af9b6a76ad3910175439b2e192d787a09446ab176cf4e3895470e894ff07c36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware or engaging in phishing activities. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=katzung+pharmacology+pdf+11th+edition PDF link annotation
    • http://www.insight-assessment.com/ckfinder/userfiles/files/85109266934.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/butukojababelab.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/dudewugoduvoxubinanavujep.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/wuxizovuxuponiwarupofota.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/zulabalatepexewuvi.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/61868463007.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/xukugoj.pdfIn PDF document text
    • http://marine-inox.com/i/File/63793024371.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/43098455462.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/romosub.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/75414495079.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/25821276591.pdfIn PDF document text
    • http://fgosvo.ru/files/files/sofukibu.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109170359347741.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/52977378295.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210901225704.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/eee0fede2cbcf9428169dac3646a62cc/61206357513.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/35890665514.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/bivafe.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/wusivi.pdfIn PDF document text
    • http://agilesolutions.in/uploads/75866167200.pdfIn PDF document text
    • http://suurelepa.ee/data/file/22753470192.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/xavirapupudomukoma.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_off0000bfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAB 17108 bytes
SHA-256: 316c9946273ff93e62394619591f6e9b7be97ca97f9ccd24938d7341d6f553b2
font_01_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 11216 bytes
SHA-256: 34240ceb48968d0752e13f48e51fd6487009e4a9b98adcbc6cda83888cb57ba2
font_02_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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