Malicious PDF — malware analysis report

Static analysis result for SHA-256 2105d0c18f2af94d…

MALICIOUS

PDF

87.4 KB Created: 2021-09-16 13:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 76752aa0e3daea82468c12a4ffe0d1d4 SHA-1: 92c81264a75b795bc238ab940548e427c3d2dc87 SHA-256: 2105d0c18f2af94dca114e68b16f5117fb22350ea8f1c9b6f743e159a1bce7ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm. The presence of external URIs and a link farm heuristic indicates an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://vietsonplastic.com/uploads/userfiles/file/sazejufelerori.pdf In PDF document text
    • http://hrudolf.com/userfiles/nonijul.pdfIn PDF document text
    • http://skrn.cz/pic/file/godemux.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/powusojuzejiwupedukuko.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/patakuwulikeziwamesobof.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/98029705301.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/92286794515.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/52125619543.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/tatefori.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/59525442667.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ujne4q5q917nc543qs3el55af8/10911012137.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0d52a224---46831096656.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/55946451959.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/73638706085.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/93748350330.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/lapateku.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/kibikajubigenap.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/lifojelebefokabewezavaj.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/70994514371.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/8171484573.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/98785738040.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/33208955465.pdfIn PDF document text
    • http://protok.pro/upload/files/61990257053.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/busirotagamewula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+emulator+for+pc+1gb+ramPDF 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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 11068 bytes
SHA-256: 5b3fccc2561ca2052c0f95ad2b3ddbd8be9c3ddbeeff50db8bb277f006bb9616
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 17012 bytes
SHA-256: b3b579c8e3b023cb0a0086145e3c3c10d7ecb0e3074d4a1521d1044ad24c6cf4