Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcc46750cc56926…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 11:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f5fcd0db21877ea921c081d18438690 SHA-1: 751c40ddaf25f46330c2cc4260465e23ea460a5f SHA-256: ebcc46750cc56926f0f3c0f4079a51c94a5e7f03adec0de172d40828dc3b0b91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of external URIs and the overall detection profile points towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://maxbrio.kr/files/files/3510976888.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a04d55bfd2827aa10dd60f0b91805868/21194542154.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/kafekuxilisibuxidepoxo.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/nozatulebuzakage.pdfIn PDF document text
    • https://webmenuplus.com/images/file/85370313112.pdfIn PDF document text
    • https://fasleh.net/Files/files/54568722405.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/10996234016.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/18815915503.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/87230362587.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/42859905840.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/gafuxesedon.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/bamomovusi.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/nivurewu.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/34114126704.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziwulirivatabifu.pdfIn PDF document text
    • http://favourtec.com/attachment/file/47254002876.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/29276495732.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/lubodovizabasuw.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/vijexogufuwutorepelusale.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161413ac6587cb---96521754374.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/75477580990.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/51433468979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=metal+gear+solid+1+android+apkPDF 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_off0000cd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 18128 bytes
SHA-256: d387181d8b8bfea699e1bda03bd6d81273f04631dd4ae834f9ecd77aa6316cee
font_01_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 10704 bytes
SHA-256: f18fb2138e82bef3adfd63a4842cc3bb7040275398024df79f5b2025cb25b85c

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