Malicious PDF — malware analysis report

Static analysis result for SHA-256 458ce2c639433559…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 12:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f957409f1b8fb7135a4ad46110ce072e SHA-1: 973a91483cea9e4d64a98909175d16a7feb567ed SHA-256: 458ce2c63943355992f60dfe408b0642815eeb4b4742307f8e60a9ade23fd1c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute links across many disposable domains.

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://synerhu.ru/uplcv?utm_term=create+outlook+account+uk PDF link annotation
    • https://alamansyria.com/userfiles/file/38080869960.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/41485611454.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/wulevikipezu.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/zomuwabofa.pdfIn PDF document text
    • http://potya.com/walonez.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zujefimejinape.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/72354034113.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/tafikivurixa.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/77995150919.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/jusimapupe.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139107a9d1d6---97930157920.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/84087715199.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49216229662.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/sezesexojoxedigutoxaton.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/9363310292.pdfIn PDF document text
    • https://norservis.com/files/files/fobobivelofuk.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/86690916084.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368bf6bc98b---rufojejenametovokijexadil.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/5144811888.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/riturajilanukumubijekaj.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/sapupukujogikebip.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/12475485470.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/ligomaxupape.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_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 10184 bytes
SHA-256: 520cf1e03a567352ff4214f8a995464299c1f6d4595bb78190e57066c461e678
font_01_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 18924 bytes
SHA-256: a2c2951b9433729d8e0401ecde22d74aa4cc0f89d775102de7df2b86656c5e3c

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