Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e99e6fd14307f5…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 23:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f05058f1e9763269043061603135a911 SHA-1: c0a6d474b2c495df689858133868455953ff23d2 SHA-256: f3e99e6fd14307f5aa0abc03ce9ff84bc7f049d3ebda4de7bbd5b35c6f2d28bb
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 4

  • 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
  • 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://4998horo.gmmwireless.com/contents/files/12627256350.pdf In PDF document text
    • http://school19-zav.ru/userfiles/file/gozidejujedulorekerojij.pdfIn PDF document text
    • https://asiapharma.la/files/files/24185482312.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/70858928538.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/14511763677.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/23745026309.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/sifisikupirarixuzepifumu.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/xokizutu.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/42254138849.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/resimuwizugokanobixaful.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/tavasosibufatokanedoke.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/rawesadusokidosata.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/50675220803.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/pamibadiwexut.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109040598_239729987.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/10032110205.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/kolakitawadekuranopuv.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/jilejafagej.pdfIn PDF document text
    • http://apart1day.ru/file/dujegufawifokavotiteb.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/kegotagekonevuwafusuvil.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/14208174086.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ad37cec13e7c611ee6cdbd5295e3e0d3/sogerotarizosabomu.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/xorovakepevokaguvevodewif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lovely+dating+app+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 10696 bytes
SHA-256: e6c7efebd75c5420ec061645d71314b304f2541c6c3b409297acfac2e6c6f89b

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