Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f7497a4003c698…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 06:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d612941e58f3499d1c232626977e356 SHA-1: 528d89b42c94ed581ea4c25a30ca64bde47db1ad SHA-256: 80f7497a4003c698b012fe0b210e5a38c4ad2cbf32931b48f9854b578809630c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm hosted on disposable domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://facilitymanagementassociates.com/survey/userfiles/files/duxajitipivowitirorava.pdf In PDF document text
    • http://mariamozharova.ru/uploads/files/vulam.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/92775402118.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614932f356b5f---43038330457.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/xojiteponi.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/xusujokozatubaxe.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/808606393.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/gejexekozuvemef.pdfIn PDF document text
    • http://cycling-software.com/files/file/tufujulifur.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/64607757505.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/vidaruwibopadumusoni.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/7290258749.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/73822578792.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/jidawanuxugijoba.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/99966306961.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1fb75ba8e95cf4b37b3a5c0c5513aa60/51885254456.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/74434831194.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/36337610972.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/14551301837.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-11/20210911184708654653.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/gomikanuzeparewanudefodo.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/wolumagunupipuw.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/15617765765.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/jisukepalupudijogijozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=beginning+nfc+near+field+communication+with+arduino+android+and+phonegapPDF 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_off0000b038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB038 15756 bytes
SHA-256: 36191110f1688895800c580636a6b323128bae48e20269b595fee27f56e99d61
font_01_sfnt_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 11140 bytes
SHA-256: 4267014b3fc4f223f4d9d744ca2f68c0974b6b63011d2e0ba7b3d481b15b759e

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