Malicious PDF — malware analysis report

Static analysis result for SHA-256 de242747590d85eb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 06:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acb885e8001ba914d8b9770205e141c4 SHA-1: 71f4b97c7f40da508965a989269d768d83efdfa1 SHA-256: de242747590d85ebb5568b34c9b434d8e2e8b2bee4dac9effdb481020daa3058
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create numerous links on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=how+to+change+language+of+android+phone PDF link annotation
    • http://familiegravesen.dk/userfiles/file/mededojokigukulitaxu.pdfIn PDF document text
    • http://geoman.cz/data/file/98827680332.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/17560171865.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/16957040482.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613764348710a---tobavuvawagafofuliwe.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/fizupikulevixev.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210913013748.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/mepelub.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/51945443993.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/20198180481.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/takilugawowozul.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/11615912984.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/51946628922.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/24275748978.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/sizuvovasaxujupuvopotibob.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/logisilevaluto.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/95165022431.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/31607154057.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_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 18596 bytes
SHA-256: 29cf27517629d25baa7d74f8006856f10e969e4715e1775eb56bc0460f06f64b
font_01_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 10908 bytes
SHA-256: 1ae9960f1e3905540756b356b630ad0228d306ba5d2791e51a61fb50ee201924
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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