Malicious PDF — malware analysis report

Static analysis result for SHA-256 080455d04ca99946…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 10:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4a7fd1799b5f249f58229dc4d65e6df3 SHA-1: bdcd6b02e124472c8b85d06973693cb8519010e8 SHA-256: 080455d04ca9994682cd43743e31873c07b23c6ca7b0badc477e1fb8d70f07ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8531

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://yhbinternational.com/userfiles/file/getovad.pdf In PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/sibiwidikix.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/tefesazebibejozitumo.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/zisazefabuzoti.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/gobubibopelelirivibade.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/35405804750.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/26191693690.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/77668590623.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/genofeliwukuxomat.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fatalapenedoj.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/jotigiw.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/foserofupolem.pdfIn PDF document text
    • http://e-menu.hu/editor_up/23866138966.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/divaniz.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/xazesutidakukirokidotesit.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/makifivepebodejox.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/29202989811.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/misilejiradixoxikar.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eme2o7tfcerbkbh04c4tb4cra2/64614398663.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/wofugamiritomov.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/426090586.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/15416795779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=block+adchoices+androidPDF 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_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10512 bytes
SHA-256: f6aca4ada6de03434165d7d140b548cb020f8fddd09344d2ac1e592738ae23e0
font_01_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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