Malicious PDF — malware analysis report

Static analysis result for SHA-256 9501760141bddbd6…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 09:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6254dac67c8a457511f27d2a12a8809 SHA-1: 91ea6f4e7416d714c637c3585b7aa0a2141b82f5 SHA-256: 9501760141bddbd6db243c532524353b1979673bdc53575419d0612043f93fb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a phishing or spam campaign aiming to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146be2885704---tekadenuvataz.pdf In PDF document text
    • https://ctsgroups.asia/images/file/jufujivopawigelifipedusu.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/85896191817.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/wujezawukosaveka.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/namizi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/10717918993.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/40098549398.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/kabamo.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/37714965261.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/kifekugojanusinusagi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gesenibujotekopidujosef.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/gutazik.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/82018492126.pdfIn PDF document text
    • https://ms01bet.net/contents/files/91737269618.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/zatugurosuritime.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f9cd9cea981ccc66c96acc2dc39e1334/17950293758.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/mesuwupejawuri.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/27247316183.pdfIn PDF document text
    • http://orthodoxnews.us/file/ziwuxevetug.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/joloxeludezafutoxiveruz.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/18318850924.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/27517594476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fifty+shades+of+freed+full+movie+downloadPDF 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_off0000ba5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 16528 bytes
SHA-256: 00bc3ac246497f3b8c8d5b3ad099e3f224d5d0528684a5599a6b953895053442
font_01_sfnt_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 10964 bytes
SHA-256: 940a8359705f7b701d17afc47b47cdd904bb4feee0df2ee29a7bfd17d30a99d1

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