Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5787526eac8f1d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 15:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ca367800478c23d7d3ef03ce0d4ccff SHA-1: 8975a6f0783a57ecf2a3d3329d6563084da81b74 SHA-256: 8d5787526eac8f1d955714b45352f4ee82abc552ceef96f74678958fb3403506
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with many pointing to unknown or potentially disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a spearphishing attachment, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tjpapigroup3.com/contents/files/kuwiloponorobofigabuke.pdf In PDF document text
    • https://veaodaibrahma.com/uploads/image/files/25858053564.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/mujatuzotozezosixate.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/82324564866.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/sedeboziwizulugemekafa.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/91975800818.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/fapimagajamizagig.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/kajorotanubagomux.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/95237629971.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a096df85a---tikufapupe.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/bipuk.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/34571151466.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e024bc1611---goturademasa.pdfIn PDF document text
    • http://imaginove.eu/data/Files/15928478149.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/24458350593.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/morukafugaxisavo.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/32284445789.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/73183425429.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/ginibumej.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea0006381---1474166601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+go+to+history+on+my+phonePDF link annotation
    • https://b2cdemo.tickets.com/content/files/daxaxes.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_off0000aede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 18292 bytes
SHA-256: b06cfb1b1df89b3714a39f932267597b16a8e725f76d72191bd4bf8bb4c82aa1
font_02_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 10820 bytes
SHA-256: 73157e9d47be49fc0b960d89e1aed89e71d81f6b41c5da92d287166227f271e3

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