Malicious PDF — malware analysis report

Static analysis result for SHA-256 73366286c80e8b5b…

MALICIOUS

PDF

73.9 KB Created: 2021-10-05 20:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 276619a81bedc32ea97de8f46b815c9e SHA-1: 02a7b67f500c9dcba2251cb4d81678ae03ca994f SHA-256: 73366286c80e8b5b7abfb1511bd54cb40c879db315b6059163d2889fa48fe86e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('coretry.ru') that appears to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the document's primary purpose is to host a large number of links on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=the+dog+spa PDF link annotation
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/14590415494.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/35335471732.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/52207868606.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/vamaterokixidoxojir.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/79095275499.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/12842412781.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/patub.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429b7a9248---26629701072.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33b2593ad---wovava.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/31839543908.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/labijatuzafupirazenejowi.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/sigofile.pdfIn PDF document text
    • http://krupongs.com/images/file/45903471190.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/wedofosixiputipevafo.pdfIn PDF document text
    • https://rintrans.com/files/sutamatekaguvadakileborij.pdfIn PDF document text
    • http://platcometals.com/images/file/jidinipo.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/woweguvinokuxiworonupude.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/mulugazelixedanizuz.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/51910699650.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/27137277688.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/gogixigatedesere.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/xozuzosis.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/womuzobizudumimaxojuw.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_off0000b7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D4 10192 bytes
SHA-256: 5813744c16b14ff46de524acbce86feb0d070ccdc6eccb58f70a549a542458aa
font_01_sfnt_off0000ce95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 19848 bytes
SHA-256: 8176358ce027ef1859d35982f95597af9a720d7dc7ee0055c75dc054b63f3626

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