Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74037ae8a908c99…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 19:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0ffb43a6575fed7dd11feabc0a2173ab SHA-1: 7def4411970f13b3d3ebe1cd8909dbad4d135559 SHA-256: a74037ae8a908c999e1940a0eeccb82101e5adc85ecd50dae3d93dc679b02f50
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using numerous links on disposable hosting, often associated with phishing or spam campaigns.

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://cructi.ru/uplcv?utm_term=mortal+kombat+x+mobile+game+download+for+android PDF link annotation
    • https://agriplan-rs.com/dados/ckfinder/files/25117829008.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/38544305565.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/11458399659.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/jomepabejupavebagubipate.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/29157319909.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/12635775049.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/dodib.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/2529792991.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/kikixudavujivimeju.pdfIn PDF document text
    • http://arablift.net/userfiles/file/telurowalutitor.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/71065096017.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/jisakivuvoliz.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/55329094113.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/01d22da250d0196ae9bfab3ed345d94d/84429122845.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/dazezokujobefun.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/futani.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/xifizukosefulexaler.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/dojoto.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/90532724646.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/zewegegalufat.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/sorinofisivepofatonima.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/gosuniwaf.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_off0000d11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 17512 bytes
SHA-256: 900258ff8cc4856ada119af00017726b74c37ef16660e5b5973b4944e582c032
font_02_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 10940 bytes
SHA-256: 24a7b8eee7133ad1b8fc780709384c9a097983c736673c331614ded0b553809a