Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96cba2f014314a8…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 13:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b9870c3410b745d6300510db7e48455 SHA-1: c58d0ac8e1d9542365532bf6f758524f10159d8f SHA-256: b96cba2f014314a85ec14b0166aa159e0696ebe934aac82627fd308dd07c9380
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is obfuscated and likely contains embedded JavaScript or other scripting elements that facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=english+alphabet+with+transcription+pdf
    • http://www.ondebiz.com/userfiles/file/ratofijopijavajaxotijatej.pdf
    • http://anduong-nhatthanh.com/uploads/news_file/kewagoguxivofadebuvaseze.pdf
    • http://tainanrup.longi.tw/uploadfiles/files/20210917_052713_8819.pdf
    • https://saigonservices.vn/images/uploads/files/38523193888.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/72414562021.pdf
    • http://sibzakon.ru/ckfinder/userfiles/files/numubopidagedaxuruvuver.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/gatonaxab.pdf
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/8792749105.pdf
    • https://poojaindiangrill.com/nbloom/fckuploads/file/dodolimid.pdf
    • https://hazeloyun.com/calisma2/files/uploads/66218283960.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/xagitinetu.pdf
    • http://oembag.com/uploads/files/202109090850381071.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/baeff06ca81a1de830bb92e9b6fa3a3c/gagulewimutuxobadesalado.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/45857709140.pdf
    • https://simorgh.it/uploads/file/70681918859.pdf
    • https://termofriz.rs/files/97221879877.pdf
    • http://geostudio.eu/userfiles/files/zuxus.pdf
    • https://smartbrand.ro/mm/file/detevadijumibomagefefus.pdf
    • http://becucci.it/userfiles/files/92955253255.pdf
    • http://kezmosas.hu/files/file/54138060006.pdf
    • https://shiksha24.com/userfiles/files/tiremunufasudapi.pdf
    • http://naviway.su/upload/files/63983371672.pdf
    • https://estatecambodia.com/htdocs/cljr/data/files/55671074619.pdf
    • http://tamker.hu/userfiles/file/degunejegivaxaregafawulen.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf5b.bin
baef07ef1d64cf1f1e72f6f93dda9fdc5a1909c11aaab59ad4ed05c36bb44245		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5B 18732 bytes
font_01_sfnt_off0000f12c.bin
4e43a41476284fd6c7462dd7ad08da4af215d15842b042016bc94cf3377b36a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 11108 bytes
font_02_sfnt_off00010aa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 16792 bytes

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