Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3559141893f906…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 05:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f54835ea001d340133af9562fc617418 SHA-1: 88a77ed553ff16be64ea476afe0e87b7f9da2c38 SHA-256: ef3559141893f9061f3a156683c793a25322c0a4ad46d690533f94b1cf15e21b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious intent through a wide array of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351ec375452---gaxirigam.pdf In PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210916_66C28FE282D93DDF.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/15887258776.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/36251139183.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/divajofeve.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/89258173935.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908102533.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/70486941089.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210916033709.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/9848090230.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/ginivepazamulifajigemo.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wevagitasefu.pdfIn PDF document text
    • http://iucecb.com/files/file/3149057353.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/11125354623.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/4m9hk427pgv4cv68bgu21k1dl3/piseperewonotatujavo.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/donuweromeb.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/62449153605.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/49228768587.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/75332452646.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/3464961787.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/laroluwimudurolomuwiz.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/korabuweluvafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=shadow+fight+mod+downloadPDF 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_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 18104 bytes
SHA-256: 24d5a509fef514f6b4a0bd8958bf27bb2278934572ea24ca858896467ff2fecf
font_01_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 10560 bytes
SHA-256: b9aa5d78929fff7501300fa22c1cd4d9ab588a2e8593ae72a4fc19b24a575852
font_02_sfnt_off0001392c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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