Malicious PDF — malware analysis report

Static analysis result for SHA-256 c371b92212fb68ca…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 21:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1939246024a0e7db45e5e00b9a8ac83c SHA-1: 6e991f216aad7f2aad6a1cac11422f67ae04c0a2 SHA-256: c371b92212fb68ca82ff1c1913e13366ae75ae3f4bb0a668d8c9b3d36ce6c3b1
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed that the document functions as a link farm, embedding numerous URLs that likely lead to phishing sites or malware downloads. No scripts were extracted, and the document body was unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://egyediajandekotletek.hu/mvc/userfiles/file/76886980985.pdf In PDF document text
    • http://toonesk.com/upload/tiwuridimirasisimorimupo.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/16065442431.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/79336c64870b210ce4fce5e9ce06a21b/wazevanatefevunokabu.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/97337950538.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/89120526071.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/pokojuxewake.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0f9ff554e35b5b58c09e84a12de899ed/zowur.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/32660910809.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bubetiredifazetosadaginef.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/rubasakew.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/xixomipag.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/94989759010.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/sokemajiruxodezekedodesiv.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/38068158767.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/dixedoditape.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/kigodogarekate.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lojipukepagowuvoguker.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/f998bf6ea651e4de753bbd1f6dcf9411.pdfIn PDF document text
    • http://195exim.com/datas/files/8593809972.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/30351017739.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/bosivoloxozigutafula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=new+iptv+apkPDF 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_off0000aec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC0 9928 bytes
SHA-256: b8f94785e4cf5fa5d75df6b1525cddd53ec4f535d3ba6ed046a43cd9efaa03b0
font_01_sfnt_off0000c4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 15264 bytes
SHA-256: d9119e025b98eeefdaab7dd564a1aafbb3028551df2f5de6a76f7979f5ce8c61