Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02e428f2cd6c577…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 16:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36719e147748f036cd8f57d2c3c0bc02 SHA-1: 868679d0b26dc3dd654fc9e46277db2eb1c36382 SHA-256: b02e428f2cd6c57706afd309418c7e56008078bf8dd0054e4723a1f56648f4d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external, potentially malicious sites, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a common tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://crysiq.ru/uplcv?utm_term=ecosystems+and+biomes+worksheets+pdf PDF link annotation
    • http://thanhnienxp.com/vietkiendo/upload/file/31152891390.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/75459010172.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/tikogikawuxoxorip.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/19693077608.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/94321185521.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/73566793378.pdfIn PDF document text
    • https://kiptep.ru/file/83064632780.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/64615390645.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/52482831696.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/rapujumijosumoxe.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/28825959281.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/xesotusinuvawifudobilu.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/vuxosotafimotogopa.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210906060454.pdfIn PDF document text
    • https://atavio.ru/files/file/97397587554.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109030628238358.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/7319204410.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/402120522.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_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 11252 bytes
SHA-256: a9ce0db6586ec7241deb90af09884cbb2b5420488495c7d11a64bc407e1175c3
font_01_sfnt_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 17340 bytes
SHA-256: 9cc35acf9782223aeffc7012a0975152689328e44b0bcb078bff3b49f39fc89c

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