Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94b1912f299e64b…

MALICIOUS

PDF

72.3 KB Created: 2021-10-02 12:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dc1c2b110feeefb7de3d23c950ae174 SHA-1: 85ca9537a42e357d6a0450406dfd5a0bc40f070f SHA-256: d94b1912f299e64b235587ad21954d6b2548a9f3ea00c4a3f1365c04ea01a121
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=research+paper+on+cyber+crime+in+india
    • http://temple.mo/userfiles/file/mizorik.pdf
    • https://htchninc.com/d/files/wibopakorep.pdf
    • http://sushistoryus.com/uploads/files/pugarozagumupi.pdf
    • https://dzido.pl/userfiles/file/wujuxajufekefobi.pdf
    • http://smenergy.kr/uploaded/file/10024715346151e65a06f7f.pdf
    • http://ttmplus.com/userfiles/files/penaju.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/6070970719.pdf
    • http://domgr11.ru/uploads/files/wodigagogezusib.pdf
    • http://verkaufs-akademie.com/userfiles/file/jatuvaseduzuxugexi.pdf
    • https://jnnjhansi.com/userfiles/file/vavodow.pdf
    • https://cr2tek.com/userfiles/Proj_Name/files/kiponojofuta.pdf
    • http://dellalontra.it/userfiles/files/ladolalerilukorimo.pdf
    • https://sentinels.ro/userfiles/file/pumorujatupaw.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/43268381525.pdf
    • https://llbyggodesign.se/UserFiles/files/95898608750.pdf
    • http://asbu.net/uploads/FCK_files/file/mebikidiwosirutumirigexag.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/uj7po4gpvurukd89qihe7fbsoh/rikuvasuvod.pdf
    • https://holycrosshealthcare.com/userfiles/files/vixodumideja.pdf
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/2140692499.pdf
    • https://e-room.co/userfiles/file/xilesabedakusiwa.pdf
    • https://ltes.tw-goods.com/UserFiles/files/36195339434.pdf
    • http://stroyindustry.com/userfiles/file/govuvabuladilurokadipakej.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f95a319222---resepesalogiwuxidudaz.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_off0000b67d.bin
95742382f414b14f1be1dff9c6159f5b70281e3d0d47d5d7fe61d929a64a19f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB67D 16360 bytes
font_01_sfnt_off0000e060.bin
3af801f572e126705914755068ae987bb6ae69c42d1c5220483efa5469ea25cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 10932 bytes
font_02_sfnt_off0000f94b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 16792 bytes

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