Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3ab089ba837d58…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 11:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9684e9a55a4f8b8f4e17d35b3d16d8d SHA-1: 4318ea3aae17887c3cb77ce7e7b43cc6c306dc6f SHA-256: bf3ab089ba837d5845ebb9d877eb9287612c0e2ef3ba38090994a75419a43eda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to potentially malicious PDF files on disposable domains. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cmtsport.com/pliki/11758516007.pdf In PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/81423918791.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/68496686426.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/fijiku.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/49090672353.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/rawodaxur.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/46530501186.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/vejamonaxigexupesekap.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/89081259336.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/72964969167.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rhvuu1m3i21tkeqa5rs6d9f3ms/jawuretexaz.pdfIn PDF document text
    • https://mimpishio.com/contents/files/gegilolibilojom.pdfIn PDF document text
    • http://davcpundri.com/css/file/nukisajakarunebesem.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/99003438407.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/nereduvixete.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c0f1b32d8c0d263e97f91430cc1048cc/68260692695.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/momonexujovotulilux.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/12614482851.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/52024557013.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/zilamedosadixaremakok.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/gajazudajafesufukuf.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/37621778860.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/71298927796.pdfIn PDF document text
    • https://labelmarket.eu/data/file/43720671672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+clear+cache+in+chrome+iphonePDF 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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10548 bytes
SHA-256: 1d171df67d197559f6f8fe458d75d6abbba022cab109d4c4928f09eff508f6bd
font_02_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 17232 bytes
SHA-256: a4042291b9c1021be64bdb46719083ac71aae8e31d47952d4045828ef33eba69

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