Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9a5db9377d3e7a…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 21:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42ebf0c199e754441a7b2417a79ad901 SHA-1: b959d083cf717e9c5cc9ca455af54675fb3c1f19 SHA-256: bd9a5db9377d3e7afd81a69f29ced27949b11c960c7a2be51bdd5caddf09f32c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://olympicthesportshop.in/uploads/majofiza.pdf In PDF document text
    • http://cuacuonanbinh.com/userfiles/file/xusijusasefakebasof.pdfIn PDF document text
    • http://sro52.ru/uploads/files/pusetexiwilinoxugukar.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141449eac7f8---30808365980.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/84890259510.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/79672604602.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/xipedi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d90b36acc---89432494087.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/52116826057.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/48943645280.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/tixed.pdfIn PDF document text
    • https://purefeeling8.com/data/file/99522608030.pdfIn PDF document text
    • http://hkwwta.org/userfiles/10457811367.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/pofazupu.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210902102554.pdfIn PDF document text
    • http://mobiliteit.nu/files/lofakivepu.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/96532274220.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/munowobewumup.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/59088692093.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/25551944538.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/zetejimijojola.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/vitalexuxudoxiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=workforce+planning+interview+questions+and+answersPDF link annotation
    • 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_off0000ad48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55A 15080 bytes
SHA-256: 30df5ffd15e8725bfa2fdc14685f03c2f03231a5f684439cc9ac92612aabba24
font_02_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 11280 bytes
SHA-256: 7b8ab09d7d235ffebd539a7bcdfcf14ab5567233ad9b0ff02d00bd03a9f7509a