Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c41045445c162c0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 14:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 47f569f098304615c22eecacf9fe002e SHA-1: 56b2b3bb0f6fee74cc89851d2e992d04c248e6a4 SHA-256: 7c41045445c162c0eee1522d328c6a86b12ecc0d9278c58e46f10ecb7a4270b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/uplcv?utm_term=hack+telegram+account+online PDF link annotation
    • http://jacsonsfurniture.com/userfiles/file/33461203096.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/pojogukojusoroxenesujux.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f939a14b0d---8351735972.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/lavuzidobiw.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210906093229.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/10457866208.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/mopejikixoz.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/dokewutejosaxevefajirokor.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210908_BAB7D5F446623E1C.pdfIn PDF document text
    • https://castel.ro/userfiles/file/legasipililolebanani.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/49068372278.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/56738125654.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/gasitezozanulapi.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/detepalopumenunaz.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/jotiluzomoribojemorate.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/17129278163.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a1cid4dl7v0kt4t846jfht0li8/repedasudemox.pdfIn PDF document text
    • http://uchid.com/uploads/file/99205670824.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/puletukoluwinolelujaf.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_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 17160 bytes
SHA-256: 01b189c83ed7124dd7c524ede7538dc5765eea2c8ea77cc826988ab3d37a4f74
font_01_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 10588 bytes
SHA-256: 3cf7b15ebcf03d0b99cf99ab48c1e0a0c76813e8eee07bdccbc1dd72a30aa708

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