Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a56f2441d6044ba…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 22:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebd3748fc3327ba4964ee745a2a13345 SHA-1: 49c984ae3a940246f765a723800b1c01abb0f698 SHA-256: 4a56f2441d6044ba7fef3d72f9c4adba38532e156e54f992876d63256efa00f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features a high number of external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://morganmethod.tuesdaytrader.com/ci/userfiles/files/zizapo.pdf
    • https://glaze-metalart.com/upload/files/laserumaferajexifizelesob.pdf
    • http://gespk.com/userfiles/file/mutoberusukemujuke.pdf
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/25827437352.pdf
    • https://atlantidegattico.it/file/28541726100.pdf
    • https://aedwea.com/upload/foto/romurezigowobipinolilim.pdf
    • http://thegioituigiay.net/uploads/files/ripigatewaje.pdf
    • https://plantbiochem.com/ckfinder/userfiles/files/24617198078.pdf
    • http://tce.vn/imagesflashupload/file/25950062154.pdf
    • https://salvatoredivilio.it/userfiles/file/susibalawowowimarebuxifum.pdf
    • https://cardolf.ro/files/davelot.pdf
    • http://getdol.com/page_data/file/57934855338.pdf
    • http://humanlitech.com/files/files/35981402143.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/507b8ccd40839dfdc23822e52bc7eb1d/76432323979.pdf
    • https://cplastik.cz/data/cms/file/vabamego.pdf
    • http://vipforiraq.com/userfiles/files/58957280771.pdf
    • http://dspec-car.com/js/upload/files/vabut.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e9a069feed738e8d60c2ae38cde3a4b7/foxedululegirotak.pdf
    • https://trompis-tondschungel.de/userfiles/file/tivemafurekenenitaf.pdf
    • http://trips-in.com/ckupload/files/soribetanaserisobimip.pdf
    • http://lamay.de/userfiles/file/naninokusejo.pdf
    • https://clove7.com/userfiles/file/87758839857.pdf
    • http://unionnutritech.com/upload/files/54246960968.pdf
    • https://marathonblainville.com/userfiles/files/zuvovapudofumutiwoxi.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/59980353431.pdf
    • http://travellerisland.com/files/48781004221.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cheat+harvest+moon+gba+gameshark
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C9 16792 bytes
font_01_sfnt_off0000cedb.bin
19085e92327aded4d2071f1a918fe673ab8a7b7a144f85e8d0a5d3f8cfc88196		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 14648 bytes
font_02_sfnt_off0000f3a8.bin
a23537da1b946272f947145c849689fc8d266e87667603103d7aaa5cac7c05a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 10748 bytes

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