Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab5636c4a1c69f1…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 11:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 63c0114878d521e1d6ccb1c13e31117f SHA-1: 0140e0788e850403cdbc66ee6f77bee443b5643e SHA-256: 8ab5636c4a1c69f190bae20362c1943fdb08c5507ab3f4256eb76024a3f07e4b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common tactic for phishing or malware distribution. It contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a dropper or redirector to a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://specializzati.tecnaevolution.it/dataload/ckupload/91483358165.pdf In PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/67762525674.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/jumabemikex.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109231331398940.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/60563898532.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161493bffa6824---nevukiwokum.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/61277003763.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee85ed2e0---25632181290.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/jedavutizobudiw.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/88544451487.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/guwoliru.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/25824532249.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/73572519088.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/55914595899.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/98582410473.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/84898649855.pdfIn PDF document text
    • https://posh.hr/files/24618700765.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/joloxuk.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/2339549551.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/widemakinibafafagepuf.pdfIn PDF document text
    • http://honghuibio.com/d/files/pevozokulimobiruk.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/gafufuwij.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/xinokom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=casting+android+phone+to+windows+10PDF 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_off0000b031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 14436 bytes
SHA-256: 9a5fdbd4d5f8af29f9f4955ad2ddcac74624f817e830642db6aeaae602d32256
font_02_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 10916 bytes
SHA-256: 7669e03e13f3ff0e10952f7aaa975349ef004affaebb81cfef1d4402a866f037