Malicious PDF — malware analysis report

Static analysis result for SHA-256 794fbb9b81e0e3bf…

MALICIOUS

PDF

88.7 KB Created: 2021-09-09 04:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 79fed21114ef4c90d93283544b5a3e16 SHA-1: cc41846f605b6d773e4e4e68032744fb5279865d SHA-256: 794fbb9b81e0e3bf9ccdab1bcf3cdeb28b41e2f9f136af4cadd9213089c13837
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The file contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to obscure the final destination. The ClamAV detection further confirms its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • 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 https://drafthe.ru/uplcv?utm_term=retrato+en+sepia+pdf PDF link annotation
    • http://auswallendorf.de/userfiles/file/4501213720.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/19826270520.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/megot.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hl1r4c0ue322fa9k8ar1bbcgtf/72021386653.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/dumiketojasupe.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/minasagar.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130db2cee3e8---gowujapajesekafekev.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/vaviweminekajo.pdfIn PDF document text
    • http://zerosquareonline.com/file/zijeribotuku.pdfIn PDF document text
    • http://weldingplaza.com/files/file/sozogurakawikul.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/rubivetep.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/jonuveguburo.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/13515105964.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/66750803132.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210904013317_89xz5j.pdfIn PDF document text
    • http://exim5.hu/_user/file/texekagit.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/bejodovabazepujoseg.pdfIn PDF document text
    • http://thecuriosityshot.com/67195072798.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/retitedosoji.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/tosokijokevisitegenim.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/8823180859.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/96827476948.pdfIn PDF document text
    • 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_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 10492 bytes
SHA-256: c1e007e38323c73c37c609ef8b32236ac97609dc062d8a6fe69f9efc64cc4ecd
font_01_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 19780 bytes
SHA-256: 846a6c911c4450310d55db51916b9e24ad4034e57319b7a3d451c2e6dc7cecd5
font_02_sfnt_off00013db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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