Malicious PDF — malware analysis report

Static analysis result for SHA-256 875dcb25c7fc59df…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 05:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b87794c77719c35d66372667e30467a7 SHA-1: 00f15d931f997949535759d56563f8219854507c SHA-256: 875dcb25c7fc59df500ef3cec206d26be4e06d68e099bc322fe6e4f8d65b8d92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting. The primary attack pattern involves directing users to potentially malicious websites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://chcial.ru/uplcv?utm_term=is+the+cell+membrane+a+prokaryotic+or+eukaryotic PDF link annotation
    • http://riviera.az/userfiles/file/50494352382.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/ledifefijakevuzeroxi.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/44997365466.pdfIn PDF document text
    • http://selidbe-beograd.info/files/61512823916.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/37837126094.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/96516414885.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/kujigagoraregakabinape.pdfIn PDF document text
    • http://thongthien.vn/upload/files/45876356268.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/87581701495.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/jepaxegefizijupin.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/lunazi.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/tetidelofa.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/zejimo.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/pobikagim.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/nirolurimokivug.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/96853910562.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43a90de27---gafarizalaxokemozuwurofe.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/9121690659.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/94552885535.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/73489852961.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73475849085.pdfIn PDF document text
    • https://bloomeng.com/uploads/besewob.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/zikezek.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_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 11036 bytes
SHA-256: 22cb72df7508f446d9f605c571072135f7aa3df333952e1374623fb0edd6555d
font_01_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 18720 bytes
SHA-256: a6017a902c59716a79ee52ab52bdc4877f9815ff09bf5faf43ab691f5dda99ef
font_02_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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