Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a2e348a4b9c97e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 21:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1df42c362d637966c2c14c5ee0d59d4f SHA-1: e15e32ba7cfde985b6194144b5ebc3a5a0899510 SHA-256: e4a2e348a4b9c97e5048731f47fa0ded1ec9c2070e12c53baf586259d19c5e1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files hosted on diverse domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://oskarmak.com/userfiles/file/93096803679.pdf
    • http://transportdiverse.com/uploads/files/11636003557.pdf
    • https://alebusph.centralcms.cloud/galeria/files/69701992556.pdf
    • https://tauthuy.vn/upload/files/97040850871.pdf
    • http://golfvillageonline.com/userfiles/file/jugusupeliputokaluzuvos.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1af56e7a54170fa470f25e9e2383dd2e/26128084929.pdf
    • https://hilanguage-com-tw.triangle-design.com/files/sojalobizixokudarob.pdf
    • https://damiel.eu/userfiles/file/xilaxi.pdf
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/tabujovisav.pdf
    • http://files.ibiza-ferien.de/file/xozudolizexekupumaro.pdf
    • http://szakkepzosiklos.hu/upload/file/27727143189.pdf
    • https://ubk-sad.de/azubi/userfiles/files/95111866254.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6b162a4f---neriwer.pdf
    • https://vgcanada.com/userfiles/file/34567617538.pdf
    • http://aihyang.com/userfiles/file/kuzikizulasowiwuzila.pdf
    • https://vilus.cz/userfiles/file/26392393392.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/pipedisewasafilenidef.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/vumosinujodudemos.pdf
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/34180643745.pdf
    • http://mizuho-co.net/file/ck/files/36661676434.pdf
    • http://www.cemeba.com/uploads/ckfinder/files/ninorekuxilisoma.pdf
    • http://villalapinetafavignana.it/userfiles/files/99145595239.pdf
    • http://jrpst.pl/userfiles/file/fodisebamoz.pdf
    • http://3mfa.com/images/editor/files/namal.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/lotijukevuwejaf.pdf
    • https://yantrasearch.com/ckfinder/userfiles/files/74132753584.pdf
    • http://silver1979.com/upload/file/logexizofemaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=can+you+do+wifi+calling+on+android
    • 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_off0000e095.bin
34ef78e7af24acf33bc0e670ab9ea8651c4ba912e1d02db3f55fd57ef43c799c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 10584 bytes
font_01_sfnt_off0000f8b3.bin
55f4b200b0f4287d2d18b8b5b88acde0e5b748dd44430c769199c11f407d02aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 19148 bytes
font_02_sfnt_off00012ab2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 16792 bytes

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