Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e40c2c63e97fddf…

MALICIOUS

PDF

71.6 KB Created: 2021-09-22 21:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83d96459867ce023a10d5ed973c6fca6 SHA-1: 4cc3c70636db78a9145af929ffc0de6ab2108e61 SHA-256: 5e40c2c63e97fddfe91058538237ae29dec1865a790efa8fabdc32c5161adf25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ever0036.com/assets/uploads/ckedit/files/20210903095738.pdf
    • http://fteq.ru/files/file/74889784203.pdf
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/tovogotukikal.pdf
    • https://nmcs.ca/userfiles/files/97494051396.pdf
    • http://www.agot.pl/upload/file/xelofuwujijonakepa.pdf
    • http://kapsalonvogue.nl/files/file/63373714545.pdf
    • http://szerecsen.hu/editor_up/86254500322.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/zirimifumomoxulaka.pdf
    • http://lmtechsolution.com/userfiles/xususef.pdf
    • http://marathon-gexin.com/Uploadfiles/files/40442561468.pdf
    • http://teplorium.su/userfiles/file/getivamefasimujabixigal.pdf
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/jasebejopelap.pdf
    • http://tcgardening.com/userfiles/file/2021091704114173499.pdf
    • http://skupka54.ru/upload/m/59814712500.pdf
    • http://fsanaq.com/upload/file/210906014333618876w4w4rmwl3lrm.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904090413.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/63ca852f13e14d3d411e00a968392d59/46616958827.pdf
    • http://capital96.com/userfiles/file/nulatefofapute.pdf
    • https://krygina40.ru/UserFiles/File/zexemeduzunofusarujorogo.pdf
    • http://porpora.eu/imagenes/imagenes_contenidos///pegafijodovuzari.pdf
    • http://belly.bpv.su/content/files/files/rasikos.pdf
    • http://dvg.asia/ckfinder/uploadfiles/files/12064953809.pdf
    • http://joesservicecenternj.com/userfiles/files/69560936382.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613135be4f159---losotoxulikowolukokibijak.pdf
    • http://worldprint.su/userfiles/file/86550071501.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vai+city+apk
    • 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_off0000b4a6.bin
9ef5e470a6e981d63e41dee3c3b494270eaf1c441e4999ccad4e75d5e2614a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A6 18812 bytes
font_01_sfnt_off0000e382.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 16792 bytes
font_02_sfnt_off0000fb98.bin
1d7d826edede918b2e166dd4f276be8b8df2cb68f28ffc38cb11d2b7e61096e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 9872 bytes

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