Malicious PDF — malware analysis report

Static analysis result for SHA-256 237070f21c67a6a3…

MALICIOUS

PDF

97.5 KB Created: 2021-10-09 04:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 267118c2df00aa11398100eb4697dc29 SHA-1: e726ab7eb2762031874150ac61f8d56740cab3dc SHA-256: 237070f21c67a6a3f1de21d5583c3470412f5c759f5ac2fdb43d194ba658077d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external sites, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF as a link farm on disposable hosting, reinforcing the idea that it's used to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://n2nnetworks.com/files/others/xitil.pdf In PDF document text
    • https://speedwayinfo.hu/uploads/file/wajitokaditak.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/96304683325.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/45631311147.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8b7af4097db46e4cb931576be3e1f3fd/11884196510.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/bijadiwobimitiwaj.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/58476378547.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/sijitawojilupe.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/bemoduwotitikewozunago.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/64730216845.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/93391191537.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/21115897686.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/45571022935.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b519a08efa2d91b366c6eebaa49e0825/41802442709.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/lafelepo.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/megolofuz.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/67766738420.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/kifajefebokapajojebab.pdfIn PDF document text
    • http://e-sheremet.com/img/xarexunezus.pdfIn PDF document text
    • http://topflexsports.com/uploads/10979458312.pdfIn PDF document text
    • https://lesura.net/userfiles/file/76844572993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=9+letter+words+starting+with+trPDF 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_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 18996 bytes
SHA-256: b809809d032985aa64e7d9385ad254788c6b27f7c7bcb3a209cf52c955d7d80b
font_01_sfnt_off000148c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D9 10684 bytes
SHA-256: 2c7493a348acaee45b4feced5f25fbb43eb7c5672f9e35ce47a598be3f057a5c

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