Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40d0c2ab21f590b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 12:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 510b6d32f735a32e481d03bc3ea45f6d SHA-1: 56c1580d176cf95cca381970b14a8e6c2abf45a1 SHA-256: e40d0c2ab21f590b4fa8bcb2dc939ac5e5e4b51d95e0a4b2d4218af74832df19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=autodesk+autocad+architecture+2016+product+key PDF link annotation
    • http://apex-architect.ru/images/file/9521645747.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138d209380bf---muditazitod.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/11353649486.pdfIn PDF document text
    • https://ksboutlet.com/file/files/tizug.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/delisajiwewapijupis.pdfIn PDF document text
    • https://led7.ru/file/91510985189.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/bozenixa.pdfIn PDF document text
    • http://signauction.net/userfiles/file/14052654809.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/54674023565.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/93340576137.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/linebipotebizulawova.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/zajigume.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/fuvolim.pdfIn PDF document text
    • https://wonkingchina.com/d/files/juxanizupafilisevegib.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/24234020538.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/gesinurulum.pdfIn PDF document text
    • http://willbramephotography.com/sowusawolef.pdfIn PDF document text
    • https://datajournonepal.org/files/surugararisivajen.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/53459812009.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/1341812315.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/82734598433.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/lisatipabekuvifabomafifit.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/3425945257.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_off0000ca80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 20260 bytes
SHA-256: dd186774acf0a31d586460e021d48ab254caf4c710b9f6b678162edf9e69c5e7
font_02_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 11208 bytes
SHA-256: 992a815e16f46d9357608bf58bb652f9b6312d7a54d0c5eca6ba22c1fd689ee7