Malicious PDF — malware analysis report

Static analysis result for SHA-256 19018f2519f9db3f…

MALICIOUS

PDF

90.3 KB Created: 2021-09-17 15:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdf55c2637913f81d15341eb7120b0fe SHA-1: 2a82a2d0b2468979b0c6dc6d20ea544fd8f9563c SHA-256: 19018f2519f9db3fb03a086f09278dd032d27890c6f59bf17bc6076f10ccc9e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and numerous external URIs, strongly indicating a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=pdf+call+of+cthulhu+rpg
    • http://vijyaiprismcrm.com/userfiles/files/8915262181.pdf
    • https://groupunsur2.com/contents/files/91466212919.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/77654856360.pdf
    • https://fotokeramika.bg/userfiles/file/wexafuxajurerebutor.pdf
    • https://rwd1.thadv.com/upload/files/70240003467.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/73178165526.pdf
    • http://gaziogluenerji.com/images_upload/files/67341687139.pdf
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/58176680446.pdf
    • http://beijingteye.com/upload/files/16305239756.pdf
    • https://aventura-agence.lu/userfiles/files/levaguzas.pdf
    • http://kaies.net/upfiles/file/9744833108.pdf
    • http://lor-rostov.su/userfiles/files/1143089190.pdf
    • https://designclarf.it/file/7480825996.pdf
    • http://turchifiltri.com/userfiles/files/13178296181.pdf
    • http://pokrowce-ochronne.pl/Upload/file/51870150049.pdf
    • http://ore-processing.ru/d/files/96784816809.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1b259748---penemad.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/xelenikiluweliso.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/92d8402861de7aea7df7234554443867/14915489997.pdf
    • http://e-hematologica.com/users/file/51911194391.pdf
    • http://saydersan.com/firma/files/89882115328.pdf
    • https://hotnews.md/upload/userfiles/files/24434571001.pdf
    • http://bakefruit.com/uploads/files/202109022223105727.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_off0000f74b.bin
50e60b18b1f40bc0af6a090ffdbd55ed954c83cc5bd3269a01f366172deed485		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 10504 bytes
font_01_sfnt_off00010f21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 16792 bytes
font_02_sfnt_off00012733.bin
1da968fb2b0e2bc00a997db576d08a91e31152653fe21b136c6c009ddca90ec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12733 20440 bytes

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