Malicious PDF — malware analysis report

Static analysis result for SHA-256 8056c7b737a3122f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 09:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af65f43654871f9896418bd56602b270 SHA-1: 3ccdb2a11d95f1adfa0ccc4a74a135ee252ff729 SHA-256: 8056c7b737a3122fe051f8a50035d2e11442ba7605b355cb818bf9de035bbaed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of numerous external URIs, many of which are linked to disposable hosting and contain UTM parameters, strongly suggests a phishing or spam campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=how+to+get+free+nitro+boost PDF link annotation
    • http://kondicionery-ivanteevka.ru/upload_picture/file/vokodixowiponofibufu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nutibijiwerilebojozut.pdfIn PDF document text
    • http://synfarm.com/upload/files/muzuwexitewuxobisivafabap.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/29708830820.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/up05kvcl549ks9inj8difir16j/44632693762.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/76600644819.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/vufuwinaruxakinazuvop.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/riluz.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356cc095940---wudedewobike.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/98853426029.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/lasawipa.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/gisinuku.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/61152921389.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/mazevaxenonawetobemobula.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/98037072736.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/wajibakugobimexinajebozid.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/bidosigobibabedapaxupob.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/sowududamutokopi.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/tarevovebad.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/77111252216.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/kekaseg.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/66225986359.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_off0000ba9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9F 10400 bytes
SHA-256: 7b9d1590d0b5b7c9e64fd468ea7bd83389a5500844c9e6642526df615ddf827a
font_01_sfnt_off0000d255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 17052 bytes
SHA-256: d1d42d0915859a999e30f0b000b82a976db07d6d5af717534337114c5fd4fa64

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