Malicious PDF — malware analysis report

Static analysis result for SHA-256 de66b1dc75653f95…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 11:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec1459f8ea592548883615be3f569e6a SHA-1: 2128854a1fb6160ed6686325c71d189fdd7aabbd SHA-256: de66b1dc75653f95504649cf3fa697df9ae82750b66d5f675bae7e314f76b6de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=free+streaming+walking+dead+season+10 PDF link annotation
    • http://ccswcd.com/userfiles/file/3913638173.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/pajujiluruf.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/79121676468.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/zelikutagejo.pdfIn PDF document text
    • http://canadanur.com/resimler/files/kewateb.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/rupametigeda.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/niwezumifarajusibe.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/lovoxawif.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/duvufuwixunuvoti.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/34586434063.pdfIn PDF document text
    • https://iohrp.org/f_files/files/sobanulafibesiremukegi.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/xaziporawulusimomomazo.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/84812307233.pdfIn PDF document text
    • http://citty.org/images/uploads/file/65015253942.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/77865255700.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/o8krmbthomgnt1c072a5ha77jn/tepibudokugumos.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/kebosofodupekufodema.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/15078657250.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/72329360381.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/gudiduxifonosikevevem.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/tosuvamisekisurebanuxadi.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/67797597829.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2d473debcd00dfb54ac4bada7ab0aad4/pawuledogufibibadezuluvej.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_off0000b3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AB 10920 bytes
SHA-256: fc67fbcf515805b74106d41dc7ea959d5945553e1ba573cf4134b8c6b51d131b
font_01_sfnt_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 16088 bytes
SHA-256: acd0c7c06db514c379e1eefdf453236281c1abe23c71ef0eefbc46e754df2e36
font_02_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1