Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bcbaa1e9f74e98…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 18:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a242b59520699ed904c026bfc5b920f SHA-1: 051cc505da4ee274322a4d319b1e28c657cdd2c9 SHA-256: 53bcbaa1e9f74e98d143f40d7164dfe2071c29d6f61ad20d94c19681b7cffaa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a lure to download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://pmms-online.com/assets/file/lurujifukilunotuvexaz.pdf
    • https://stcc-sa.com/motakamel/Ups/files/97415943912.pdf
    • https://jungleflightchiangmai.com/Uploads/files/sagub.pdf
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/51484307530.pdf
    • http://kite-surf.sk/files/51318189143.pdf
    • http://dongsimkindergarten.com/upload/files/83727114036.pdf
    • http://obchodsezlatem.cz/upload/files/36494572783.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca67cedfb---68716330816.pdf
    • http://montagnobozzone.it/userfiles/files/27038913302.pdf
    • https://chilegastronomia.cl/uploads/userfiles/files/83702008385.pdf
    • http://industrialsupplies.pk/userfiles/files/99158105752.pdf
    • http://soldearenales.com/galeria/files/49069097270.pdf
    • http://houtackers.nl/userfiles/file/zojivuxumojek.pdf
    • http://ylplj.com/ckfinder/userfiles/files/duwibokojituzarotiwikewiw.pdf
    • http://balone.net/_upload/file///disutitawexubixikavi.pdf
    • https://www.sterlingsez.com/ckfinder/userfiles/files/nanonadak.pdf
    • https://recapress.com/ckfinder/userfiles/files/33669248214.pdf
    • http://ncdesign.it/userfiles/files/bugokowutopumataduvu.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/47829133211.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/07nbo8jn562kc9s1ad5260917t/mijubexurusodip.pdf
    • http://doudou.tw/userfiles/files/68991614048.pdf
    • https://gobelsprofil.com/upload/files/futafavogavekofuxene.pdf
    • http://berbun.com/user_img/file/23976137709.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/33769801877.pdf
    • http://pharmabiosolutions.com/filespath/files/20210908230122.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/91657172367.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=focus+on+academic+skills+for+ielts+teacher%27s+book+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_off0000d53e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 16792 bytes
font_01_sfnt_off0000ed50.bin
94e2d5d2657a139c3df55dffcc657fb344326720c159ea60bfc5df0722908c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 15724 bytes
font_02_sfnt_off0001158f.bin
48f6896a5a0bfc700271b1f6d16b4fdf4384e0f2d4f73244290a5611c85c09b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 11228 bytes

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