Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe5978128702e70…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 11:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c010c42c8fab8cee79de456432866e4 SHA-1: 5eec98ef199d136a70bd31e1d80e2f6fcc2d7fac SHA-256: cbe5978128702e701f540738bcd5dc41c92caca3133ba21ead8f99f71f26effc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs across various domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://archism.ru/uplcv?utm_term=bus+man+parking+3d+2
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3ue8o3c21sqihfntv9nv4i1bhn/xaferegobarejov.pdf
    • https://thefertilizergranulators.com/d/files/godorefavejaminonabawutaz.pdf
    • http://ck-buhgalter.ru/userfiles/file/66550437173.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bedf7929be---wijirakedefa.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/jafiwavariwelimox.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/45266912931.pdf
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/judewikadoxijizeponaso.pdf
    • https://yunglin.com/uploadpic/files/62824410122.pdf
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/74365898605.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/fowifijonin.pdf
    • http://www.donboscovizag.org/images/files/vinudirogetebijonilus.pdf
    • http://aorganboys.handyfriendship.com/upload/files/kuxitepobevafin.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/gifamujosugasatuzox.pdf
    • https://cs168.tw/upfiles/editor/files/jesokerabifaruxuf.pdf
    • http://se-ty.com/uploads/userfiles/file/fokasebaf.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210907_215125.pdf
    • https://plentis.eu/ckfinder/userfiles/files/volilewibunamamaxenaki.pdf
    • http://hawaiianhunareiki.it/file/5594410262.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/15989554759.pdf
    • https://saikekanglun.com/filespath/files/20210916092647.pdf
    • http://local-minicab.com/survey/userfiles/files/xepeto.pdf
    • http://highlevel.pl/userfiles/file/74070331896.pdf
    • http://hockjoohin.com/admin/uploads/file/wafosijisotelezibo.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_off0000b860.bin
f97a9447cdd4d68e454c019eabe26f6a36fce262e4c8d61ec49fff9e83ecf5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB860 16108 bytes
font_01_sfnt_off0000e208.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 16792 bytes
font_02_sfnt_off0000fa1f.bin
cce657a480053f15d674db185ab6406fa9040ab42a136a13bb752e4de84e02ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 10876 bytes

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