Malicious PDF — malware analysis report

Static analysis result for SHA-256 3411fe44354d57e9…

MALICIOUS

PDF

76.3 KB Created: 2021-11-12 15:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dea2c54b35827fcc26f3f13c58ff251e SHA-1: ea72d13dc8b0698b32bc783dbe43ca64978609ef SHA-256: 3411fe44354d57e92af0a83445e1de3a205ca9dd30c96225fa00281ac6700485
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While the document body is heavily obfuscated, the presence of many external links suggests a phishing or SEO spamming campaign.

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 http://kxnjl.com/userfiles/files/zazunivekarimizovo.pdf In PDF document text
    • http://vinhosnorte.com/images/files/90844225271.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/74318026538.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/fabafemolekumuxipasulawid.pdfIn PDF document text
    • https://flomogroup.com/upload/files/menelomu.pdfIn PDF document text
    • http://splogservice.ru/content/files/14538973338.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/86599080313.pdfIn PDF document text
    • https://wittnebel.dk/file/finafut.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/gewipitojagexegulovemugi.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/90604976884.pdfIn PDF document text
    • http://hydrem.ru/images/file/6133364518.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/92325154669.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/16440973836.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/62581683882.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/dusosonigobagofivewume.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/duxigudozufef.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/62167409287.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/acgl8m4gp5ci3est53tn0sivi7/23188050258.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/89018645578.pdfIn PDF document text
    • https://cnprint.ro/userfiles/file/43310172807.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/60988610601.pdfIn PDF document text
    • http://meditopthailand.com/file/39923328919.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/10033577323.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=features+of+explanation+texts+year+4PDF 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_off0000c77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77F 10724 bytes
SHA-256: c89bfe7d7402ab66ae1e0c37ae68e80e47af30b77bc006c3c9b114192a878fa4
font_01_sfnt_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 17144 bytes
SHA-256: 83a78cbdae001f698c14c5ef47fc22061699050cbc537997b6d73435eac27785
font_02_sfnt_off00010cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAC 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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