Malicious PDF — malware analysis report

Static analysis result for SHA-256 a942737fd91c63c8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 08:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12c56e1ebe64ef82a43df09a524b0c35 SHA-1: e5d266a2e92209efe525dff90e5cc6d7f06e0d08 SHA-256: a942737fd91c63c85912cca75970b2102d07ac5617951ef2e02b6f823e69ca66
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to use numerous links for unclear purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=vivid+video+maker+free+download
    • https://gogreenonline.net/userfiles/image/fckeditor/file/64257586848.pdf
    • http://hoachattn.com/image/files/60806901293.pdf
    • http://nenkin-t.com/upload_img/ck/files/18730202775.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/totarana.pdf
    • http://cartonwrappingmachine.com/userfiles/file/84210517009.pdf
    • http://kingsauto-bar.com/js/upload/files/magidukoraravilupojemez.pdf
    • http://veszpremlizards.hu/_user/file/74089672005.pdf
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/denimufojovuso.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/71430901535.pdf
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/79567898465.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/81332654269.pdf
    • https://webmedcentralplus.com/userfiles/file/97911690210.pdf
    • http://parentini.it/userfiles/files/katozubokodawutuj.pdf
    • http://kapsalonindex.nl/images/uploads/nalorimozamuziwegovaw.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/vigalulomive.pdf
    • http://around-sicily.net/userfiles/file/wakovib.pdf
    • https://oreopay57.com/ckfinder/userfiles/files/lasufime.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616d866f6f---76803064053.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c952bd96ee---supizelitafamod.pdf
    • http://to-kajihan.net/js/upload/files/40365746837.pdf
    • https://joinvita.com/neu/userfiles/file/rinumibiwapur.pdf
    • http://studioarchperissinotto.eu/userfiles/files/zumemogivixutijamu.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/4825209385.pdf
    • http://dajuicebarus.com/uploads/files/bidimodinefizagideze.pdf
    • 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_off0000dd9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 16792 bytes
font_01_sfnt_off0000f5ad.bin
d29767d40c7b62680f0b663c08c4c23db79b8252195209abc971cfa20d73e962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 17380 bytes
font_02_sfnt_off00012248.bin
bde15f13015ddab00750848067f0ea0ee47d8dca6a2c76685d5bc60c73b34038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 10464 bytes

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