Malicious PDF — malware analysis report

Static analysis result for SHA-256 2863e1a643b0475d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-17 12:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2936045cc7720b9df87c58c811b1df13 SHA-1: 485466860f0ec3c39e0e0cabf1ec78d436e0c8a0 SHA-256: 2863e1a643b0475de2145e71acb18f216fec523db61ce8836b3a136af9401b98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The PDF structure and embedded URLs suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=mock+location+app PDF link annotation
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/muvibunat.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/kirevopufikile.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/xenoden.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/turevatizuweso.pdfIn PDF document text
    • http://liily.jp/upload/file/20210911144335.pdfIn PDF document text
    • http://npas.ru/pic/file/papogof.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/fixinakedobol.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/buselosofivukegakaveje.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/jafizasufud.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/fbf917bfe385305b003208dc4a76c4c2/10312439812.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/jotidasadiso.pdfIn PDF document text
    • http://newmob.it/userfiles/files/46947444828.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/fefizipoz.pdfIn PDF document text
    • http://underbutter.cz/download/foto/91760002767.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/42363602335.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/bilupiwilemekuxunaweguw.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/31759253636.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/82814941983.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/pupozituviwideko.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/selomewovuj.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/hvrnfppdqgl1f20rgfl0g8h9ie/miporikal.pdfIn PDF document text
    • 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_off0000aff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 10052 bytes
SHA-256: 6e359839948e1cbc35f4336dadefef12583058d3fce72d1442bea60ce4fba447
font_02_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 14420 bytes
SHA-256: 8fc1395f697ee8e21d92a8f4ba3b3e90901a9064ca51064cdefb23ecf63ccdde

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