Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a398cbb6700a44…

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 05:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3c1a559986c3b5bcb429da139c019d14 SHA-1: 5f1678624560e7b80a9c21409dc2619691efebdd SHA-256: b5a398cbb6700a446e018253c3d3241d823c8d30d0ab6e34a1d6d427e60bb236
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to unknown PDF files on various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external links and the 'link farm' heuristic point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://grupophi.es/uploads/files/diletuja.pdf In PDF document text
    • http://gioiacompany.net/images/upload/file/19144375649.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/60981434857.pdfIn PDF document text
    • http://darec.sk/files/files/21611439982.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/45340c310c8425fb84afbf45e58b7e00/43984475577.pdfIn PDF document text
    • https://jotelek.hu/files/file/17576084285.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/tobenezagifavalav.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/gawidomim.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/kegimovunovitow.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/gijusakumexabifu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/wawubuleponiribiditoguw.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/46162413566.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/59608083626.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/14999889328.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/feserutomibaxasadavena.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f61c5e18c---22280364904.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/58972852248.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/60631482814.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/fedojeden.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/lubawitibatu.pdfIn PDF document text
    • https://cristalensi.com/public/File/ribipomutexozuwogilut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=escape+plan+1+full+moviePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 17756 bytes
SHA-256: e490c89cb3a1d61a3b04ccce0cc9479c7a48d7c8415526b805ecad9133fc65b6
font_01_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 10644 bytes
SHA-256: 070ab84492e95e1dd1471e2a85fd0c16c0ff607dbb2d6d81750141809885a71d

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