Malicious PDF — malware analysis report

Static analysis result for SHA-256 52412ef45f8dd6af…

MALICIOUS

PDF

67.8 KB Created: 2021-01-28 13:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 070197106880ae3d2904c0a45983b48e SHA-1: 81ff5834f4717dfd2c1239594b27cbea68beeba1 SHA-256: 52412ef45f8dd6aff888ff157be79b04d3264a896c1c1ba3b2cdfe59741a6064
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to host malicious content or redirect users to a phishing site. The document body, though heavily obfuscated, suggests a lure related to book searches.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/wb?keyword=digital%20middle%20school%20books%20by%20black%20authors PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501383/normal_5fec38a269e16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494136/normal_6002a7712f19c.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/jhajiyq/84116833179.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/iiieggg/hack_game_dawn_of_steel.pdfIn PDF document text
    • http://siankaanmexico.com/78353300112cvowy.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/cgcji9A/puzumixatobinosoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466366/normal_5fd27d134d4a2.pdfIn PDF document text
    • https://cdn.sqhk.co/wemofisejaf/OWFL4hd/83160222071.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/jhMQjbk/nfl_top_100_all_time_team_tight_ends.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vudatuvabejosix.epizy.com/letter_sheet_size_in_cm.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 5660 bytes
SHA-256: c52c0e816d336947b3b27d6543e2d30f1d812556ab3b92785d36bcc9e1f6fdce
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 10428 bytes
SHA-256: b21dcf68fe85b7178d9c7988086839c171d81befb8d811afe9dcbd7007d2527a

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