Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18e8ef547ae34c6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 10:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc567f849995689fb77688c13fc49e9e SHA-1: b96db3a4112b89d12e4e9e427a2c2e2a9a58c2a7 SHA-256: a18e8ef547ae34c688b690beb59673330182c3f017eac84620dd78c207555e1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or content-scraping lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asharfilalkulfi.com/ckfinder/userfiles/files/parapab.pdf
    • http://lovesenergy.nl/file/56641692857.pdf
    • http://zoekidsworld.com/userfiles/file/gagejamamapiw.pdf
    • http://goodwill.pl/userfiles/file/33477804817.pdf
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/54798490332.pdf
    • https://mn-lawfirm.com/box/userfiles/file/95354838703.pdf
    • http://kurumakaitori-one.com/js/upload/files/34645753400.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/50796608050.pdf
    • http://www.somdattabasu.com/fckimages/file/61692970034.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d02c5393d---botiriwijixuwa.pdf
    • http://duhochoangthanh.com/upload/files/42374854435.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/13j6b5r14ta63m2ejnnoudfd2i/zupunomowelasalis.pdf
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_DBDB9C2A4D6B7CAC.pdf
    • http://saint-party.com/media/file/senonokej.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/dekifirotubokamev.pdf
    • http://castudio.eu/userfiles/files/vaselirojawokelixukilu.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diperelimulidisa.pdf
    • https://rotitelor.com/contents/files/19638196745.pdf
    • http://justsayhi365.com/uploads/file/severonapofedenemoz.pdf
    • http://bangladeshceramicsociety.com/uploads/editor/files/fukibolojopetibezidober.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/58693109941.pdf
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631221863.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=renee+rose+books+read+online
    • 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_off0000d818.bin
f82497f986661723ce3408bb692e7886f457650819c29873fc062a853fdda367		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 17512 bytes
font_01_sfnt_off0001059f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 16792 bytes
font_02_sfnt_off00011db6.bin
da8cbea5f95bceace19586bf2c08af8434a928f4197c1251a86073371a2b5b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 10420 bytes

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