Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8508ee5fe68347…

MALICIOUS

PDF

54.0 KB Created: 2021-10-03 02:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f9bd49dc63166a975b3570ecea0b8670 SHA-1: 469ae5c7148b93f9cd8ba1944e42828636de0a46 SHA-256: 4a8508ee5fe6834730a269e455bf92796a338b0f8f5b1dd51f97ed22d40ec326
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to other PDF files hosted on a variety of domains, some of which are flagged as disposable link farms. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6600

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
  • 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 https://eobliecky.sk/userfiles/file/pisadof.pdf In PDF document text
    • http://banglenhospital.com/UserFiles/File/sifuno.pdfIn PDF document text
    • http://rensind.com/upfolder/e/files/20211001134226.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/87629043216.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158ccedb0b58---36695870480.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/roboxevaf.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/vabenitudizotajerijofameg.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/48047085227.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/61173624696.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/82439601638.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109120702115158.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gebuwimojeduterinijudexuw.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/bebulosuvogezasoma.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631687735.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/53423909510.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/090913048440.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/fumidoxawi.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/kupugabilo.pdfIn PDF document text
    • http://kaies.net/upfiles/file/javaxanumosofeg.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/58990121052.pdfIn PDF document text
    • https://reha.bg/content/upload/file/37080240983.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/43120677244.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/8676084662.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/bixupajopiva.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/kirag.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/sowigexuweluzawilezap.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/28628387a4f07ce1733e80f844425b93/latoroketaruwilubaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=prostate+cancer+mets+to+lungPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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