Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0db8fa363a5943…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 20:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 19493a3a8e5144108447f2063e498ea5 SHA-1: ee64cd3a76c51282937edf0bb246127c4a4fd666 SHA-256: 4f0db8fa363a5943445f4de5a7da3d8ea2f9e54f403fce1af340cd912183e7c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. The PDF_URI heuristic specifically highlights a URL with a 'utm_term' parameter, often used in tracking or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://irlanc.ru/uplcv?utm_term=unlock+android+free PDF link annotation
    • https://bonvoyageindia.in/ckfinder/userfiles/files/72025689816.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/wenulewefaxemigej.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jomizivisaw.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/gonegakagisorab.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/50064789749.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/93378691812.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/33298061866.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/jijevepowenuwebo.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/gaxubolozapuwuroz.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/5898371952.pdfIn PDF document text
    • http://villanakarin.com/userfiles/files/14655872209.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/vupuwojelowudewuvofaj.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/16163618214.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/wurulufilekiselezurezaw.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/27769056043.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/keremejizuvuvid.pdfIn PDF document text
    • http://fitviewer.info/files/file/fajawe.pdfIn PDF document text
    • http://gojjang.com/uploads/files/guregu.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/49453708915.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/57132728118.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/tezama.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/wexupikawowiluw.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/zaravudomenupepi.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/luvepusixal.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/mawekitifuwixut.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_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 18256 bytes
SHA-256: e969ebaa42f3a644c99403e2650bc1c7904641fef7ebd271f7d5540f4ace9f2c
font_01_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 10304 bytes
SHA-256: ea8e52bd43b74b776672131b08d7b7c4d1189ae7f8cb97636c17dffec21acf8a

Open this report in the interactive analyzer, or submit your own file for analysis.