Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3b95a45d4db3ac…

MALICIOUS

PDF

81.8 KB Created: 2021-10-05 23:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 565776d7b1c5ae158539348e38b261be SHA-1: cb76d22712df5f40714f7305985e27d50067d979 SHA-256: cd3b95a45d4db3ac8d0d089504c43a19ea13a60ea34726b51e1528d2478d4788
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external PDF files. The presence of embedded URIs and the nature of the heuristics suggest the primary goal is to redirect users to potentially malicious content hosted on various domains, fitting the pattern of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://horizonpestservices.com/userfile/gejubewejepixiguwezo.pdf In PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/22754373550.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/vawixekigutim.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/58276426226.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/10453422209.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/50283777653.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/20585149587.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/32156555704.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/24459456477.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-23/20210923173104340619.pdfIn PDF document text
    • http://special-pharma.com/upload/files/nitusurefipenopo.pdfIn PDF document text
    • http://3sdent.com/upload/files/86718585781.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/53089426831.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f0948e5f842057feab9f202cfbfa7124/mobotaju.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/56325002835.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/xepifusorazepasozovosiber.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/26101469474.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/18320913612.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090711265917.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/7395559746.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/42387149434.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/71172019016.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327136db527---93921102372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=alcohol+and+water+homogeneous+or+heterogeneousPDF 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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 17500 bytes
SHA-256: b5fbb8ff5d19d41e144e185955dbf9ba9d737c20f4e6c2aff31156dec0c7773b
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 10892 bytes
SHA-256: cae34e4fe016a89b86337eef3431114c18e8bbf0b9fafdffe11ce9ed20f670d8
font_02_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.