Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e2b9d61d617a3a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 01:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f826ec0e5ea3d9c4cbf7c63f56b99ee7 SHA-1: 84693cdadbde6950f6e8bb09eedd9d39f3f7aa93 SHA-256: 17e2b9d61d617a3a9c765ba9e08851d250372d931b00a198de6a6eeec8245fc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://anne-berger.de/sites/anne-berger.de/files/fkcfile/87706741196.pdf In PDF document text
    • https://k85shj16h-561lt.com/contents/files/lofumobosotoj.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/84897609426.pdfIn PDF document text
    • https://krossi.ru/images/content/files/49357902119.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/pexixuvu.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/85787430283.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/89712649000.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/fevizuwureteraratijo.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/98173033077.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/lunukobowemovezufemanijo.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/ziroxakazuzubo.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/11379266935.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/legesaxez.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/pusikijutebewivaxo.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/15699427310.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/1063940505.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/tokebaperu.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/29513839809.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/34947446484.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/xikowe.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/pigazubemejenonuzotapajuk.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/88007965305.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/nepuxosewomado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=twd+comics+read+onlinePDF 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_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 18168 bytes
SHA-256: a7c0f1dbae4f783d507d19bb9d92386ec469794716245d7f5bebb3045565a9b5
font_01_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 10480 bytes
SHA-256: 7f008e52040473f8767608a889d8543d0851b072d44316cdfc1408ee0d327123