Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b668b4e75af409…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 21:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23c9b4d294da72d1fac4c958b7dd00a6 SHA-1: 18deed280ff4e5d5131bd1f355f6014f809fb2a0 SHA-256: a9b668b4e75af409b930d93f49a675d40d0ec5ef7989dcb15c7f3b216d7dbb3a
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that directs the user to a phishing website disguised as content related to 'Diary of a Wimpy Kid'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

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://jumiwimov.ru/aws?utm_term=diary+of+wimpy+kid+long+haul
    • http://omoikiri.info/497373019591upsl.pdf
    • https://cdn.sqhk.co/pisomuma/do9ijbU/xodorenesusalulesufituge.pdf
    • https://cdn.sqhk.co/dawadetugas/hhcwAhe/race_car_crash_compilation_2019.pdf
    • http://appless.space/bajobabq05.pdf
    • http://cosmostil.top/troy_bilt_weed_eater_carburetor_adjustmentjd21c.pdf
    • https://cdn.sqhk.co/xugiwatokax/5ugdjb3/xenidubukutaxaxiwodemaf.pdf
    • http://xemizawufogutuf.scienceontheweb.net/how_to_make_a_vrchat_avatar_from_scratch_2020.pdf
    • https://cdn.sqhk.co/lalivaga/c616qxA/tangle_teezer_back_comb.pdf
    • http://qqkaxes.xyz/how_to_create_a_user_manual_in_word_2013rr2sv.pdf
    • https://cdn.sqhk.co/gosukutusu/WViejio/nadopawofa.pdf
    • https://cdn.sqhk.co/kumotuxijufu/hhbhchd/marketplace_grill_mira_mesa.pdf
    • https://cdn.sqhk.co/musutalivun/crHgThK/witcher_3_viper_armor_crafting.pdf
    • http://on24-system.club/42195042362kad9p.pdf
    • http://kersita.space/induce_labor_sims_4_not_working4dvzz.pdf
    • http://kolegutoravi.mygamesonline.org/lipudasanitifadovatin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000eb55.bin
90fbfa7fd4a6b4881de1fa1d2931e1b22d1e5eb160dbc446f0375c31d146a32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 5536 bytes
font_01_sfnt_off0000fe28.bin
f39ba9a12ef718e9dc2944be615479bbd554b36feb60c302cf258018e6211daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 11344 bytes

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