Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91b588ccaa80c9c…

MALICIOUS

PDF

75.6 KB Created: 2021-03-14 12:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5913c40d33fd6a97d9a92944a1bba025 SHA-1: af785770a2ab1ddc1c47cb925794b910e1359df8 SHA-256: f91b588ccaa80c9c59287ee76a4dfa6e9884d3e6199bf03fee3a990acb4084c7
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with https://nipisod.ru/123?utm_term=idaho+fish+and+game+salmon+harvest+report being a prominent example. The document body, though heavily obfuscated, suggests a lure related to 'Idaho fish and game salmon harvest report', aiming to trick the user into clicking the malicious link. No scripts were extracted, but the presence of external URIs and the phishing classification strongly indicate a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/123?utm_term=idaho+fish+and+game+salmon+harvest+report
    • http://termometr-medikal.site/26542869373pg7jz.pdf
    • https://cdn.sqhk.co/moxibusas/ciBAieD/xofabumumeradaverol.pdf
    • http://retys.fun/dasiweluvagovivisinakewfr33.pdf
    • http://btsworld.org/magna_carta_effects_today60vmg.pdf
    • http://1s.london/amtrak_train_timetablex875i.pdf
    • https://cdn.sqhk.co/sowodopevew/hGhahhJ/wukamanuvimedikoxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wanasuvedigo/dolce_amore_movie.pdf
    • https://s3.amazonaws.com/sobaketemu/kawonuzewakitub.pdf
    • https://s3.amazonaws.com/jivuxo/65829018874.pdf
    • http://kegenag.rf.gd/plus_messenger_apk_2019.pdf
    • http://punolubumima.epizy.com/getokapanalanewite.pdf
    • https://s3.amazonaws.com/vexeliku/mitra_bukalapak_apk_versi_lama.pdf
    • https://s3.amazonaws.com/nerugiraxura/chernobyl_series_parents_guide.pdf
    • https://s3.amazonaws.com/wenobagupexekap/lou_gehrig_luckiest_man_speech_text.pdf
    • http://xafovam.epizy.com/fleecy_fabric_softener_sheets.pdf
    • https://s3.amazonaws.com/zemunomipazikez/how_do_i_find_out_what_my_love_language_is.pdf
    • https://s3.amazonaws.com/viwoxuz/blank_page_with_border_designs.pdf
    • https://s3.amazonaws.com/juzinaramip/lepamifudopiforo.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_off0000e9a5.bin
a2b17dfc068c32263d0dea5b93079093d4800ccac6c5916b9ab6aee9efd5cac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 5452 bytes
font_01_sfnt_off0000fc0e.bin
f578ab375e47f1ce03954de2a28ebca7703ca963cef258d654fe76b85a901082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 10364 bytes

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