Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b05ccca45bed34…

MALICIOUS

PDF

72.4 KB Created: 2021-02-18 09:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 164e36068f121d39052c5054df0a89fc SHA-1: dcaf54f2d99ed942aa83737f4efdb18475062f7a SHA-256: 49b05ccca45bed3454b3c607580efaf8cb2bf39f5d864e2a7f32b323b3d53cef
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that appears to be a lure for a biology worksheet, likely intended to trick users into visiting a malicious site. No scripts were extracted, but the presence of an external URI and the nature of the ClamAV detection strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=biology+mitosis+worksheet
    • https://cdn.sqhk.co/zetanitanedo/Oichfjb/hideaway_hills_campground.pdf
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5fff0be53439c.pdf
    • http://xuxoxobu.iblogger.org/vebukotadozoxewix.pdf
    • https://static.s123-cdn-static.com/uploads/4409107/normal_60012e35273b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xoguwavosuje/bridal_chorus.pdf
    • https://s3.amazonaws.com/kavifunaruvi/information_security_awareness_topics_2018.pdf
    • https://s3.amazonaws.com/webipejonavuv/asp._net_core_blazor_templates.pdf
    • https://s3.amazonaws.com/wurivuve/best_action_rpg_android_reddit.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/atltico_madrid_juventus_formazioni.pdf
    • http://waxaravibew.epizy.com/59108602236.pdf
    • https://s3.amazonaws.com/zagubip/31939617200.pdf
    • https://s3.amazonaws.com/gedexim/large_bunny_ears_template.pdf
    • https://s3.amazonaws.com/daxemo/vubotidamamepi.pdf
    • http://nijopupeboxisa.epizy.com/xixuduvijedotixibumasulak.pdf
    • https://s3.amazonaws.com/pirofopafu/tebinerim.pdf
    • http://lusiromipu.epizy.com/33581686639.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/jidajo.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df84.bin
8cacd31afe315852c6902470b9d5fc2bccb6ef16ccdadb324c047e1d43359f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 5196 bytes
font_01_sfnt_off0000f123.bin
8ed6a9b2c1bdf82cbe4287bd8e10541105a48726fc0ad4ecdd93fc3f7e6637ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 10420 bytes

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