Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0b525ab7525364…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 15:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8410acb67b1f32a31fb1d8d7a6c4ffce SHA-1: 694a983e9f6cf1a77ed90ff50fdb501268495e63 SHA-256: cd0b525ab7525364353784a5878bb10e6ead3b875c41ae9cc966f40ac895277e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=after+we+collided+hd+free
    • http://phuongsen.com/img-chamthi/files/xemeb.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6993950164.pdf
    • https://wspaperbag.com/userfiles/file/19177452135.pdf
    • https://neksav.com/upload/ckfinder/files/fenizidaderuvojofilazon.pdf
    • http://asesoriazabalburu.org/azaba/files/file/78182831676.pdf
    • http://skkouty.cz/ckfinder/userfiles/files/kujodiwazabutizot.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210905181705.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16137828f21cbe---jowefunukuzexusunixo.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32de21d6---51296143596.pdf
    • https://questyme.ca/userfiles/file/zezadozeduriwitid.pdf
    • http://chayka-svg.ru/files/78543006129.pdf
    • http://jarosi.hu/files/file/42526284715.pdf
    • http://buddhavehicle.com/userfiles/file/fomuvefot.pdf
    • http://zzquansu.cn/d/files/xeluxiwusafifuwat.pdf
    • http://lumieye.com/userData/ebizro_board/file/lusemipepusexukuz.pdf
    • http://ruben.pl/ckfinder/userfiles/files/digirafag.pdf
    • http://unseretochter.com/images/file/revawatatiwaj.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/29082147577.pdf
    • https://urbanlivin.lu/userfiles/files/womovifisujugapu.pdf
    • http://101eyewear.com/luutru/files/lanadimekibuvotatemovifo.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_off0000ada1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 16792 bytes
font_01_sfnt_off0000c5b3.bin
9a2b94785b9354370b182187b4ddf4cce417e5ea34b0de2bb85a7a9b30b9251b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 17940 bytes
font_02_sfnt_off0000f3f3.bin
94c2ffaed780b6dc877bdb9edddc1a604a1f060eee8e1c4a6af9f3c2e91304ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 10208 bytes

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