Malicious PDF — malware analysis report

Static analysis result for SHA-256 3679024b08536c79…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 14:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5773e0ee892e7b8424a583d601ec8c1 SHA-1: 64fd34bb9094050c88e1c31bd6a9f9db63f47955 SHA-256: 3679024b08536c7959db38b4f93ce80e7999a0c1e8099fdd79d884f5d0283a3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to drive traffic to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=ccna+switching+pdf PDF link annotation
    • http://erictex.com/ufiles/files/duwimeg.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/48918806392.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/fukutabivasipisireb.pdfIn PDF document text
    • http://kbchina.de/upload/zoledezasumurigebuno.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/87009345538.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/redejerud.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/97491264208.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/luvajitiligi.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/9804951366.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/11464724553.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bdd07cc3438adbad1418a5e32953c9ce/vupuxefejexa.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/70160287834.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/91311927851.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/94839209556.pdfIn PDF document text
    • http://didula.com/img/file/42677049555.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/60713369526.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/76992368696.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/nesonebuzamim.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/bevobufur.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/69414046835.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/dijutoboreza.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/12526561638.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/gikumixapulunudakamog.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_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 17764 bytes
SHA-256: 72986633fbb5f1ed99825ceb6e9366f49a9f1dfda4eba76ed86756aa4017329f
font_02_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 10616 bytes
SHA-256: a6576b7711c28e441e9f6cf0a0f0e8b09c01ff25caa83e09989eea754bf80fa7

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