Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f820f7cf87dbf7…

MALICIOUS

PDF

79.6 KB Created: 2021-03-12 21:35:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8929703b7c3996b9623601bbbd86b0b SHA-1: 7de0ecf52c211dd3351d0ac0a7424464f6201803 SHA-256: 73f820f7cf87dbf77051c8a19a60b8ce9bba52a4c76f3863ece3d271a193c569
96 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, with one specifically identified as a lure for 'beginner english short stories'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

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://golowaki.ru/123?utm_term=beginner+english+short+stories+pdf
    • http://pufivuziviv.mypressonline.com/bilekugilaze.pdf
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/xotavasikigibijub.pdf
    • https://cdn.sqhk.co/nasubivapu/Rgghcgg/sanariwuzilusukifixu.pdf
    • http://banademebilite.sportsontheweb.net/how_to_use_pellon_thermolam_plus_fusible_fleece.pdf
    • http://nigasheff.xyz/1315624829qd04c.pdf
    • http://prodson.space/how_to_decorate_a_christmas_tree_professionally_with_ribbonktksn.pdf
    • http://fresh-ita.fun/virtual_table_tennis_hackjl0am.pdf
    • http://maturibcgj.space/mosubozjml6c.pdf
    • http://myyshooop224.site/bail_application_format_under_section_307ysem8.pdf
    • http://nokiwurugibub.mypressonline.com/adjektivdeklination_ohne_artikel_bungen.pdf
    • https://gufavugowiguxu.weebly.com/uploads/1/3/4/5/134590320/devutibunizexota.pdf
    • https://cdn.sqhk.co/gotakavapu/4YgqgiS/gang_clash_game_mod_apk_1._0_4.pdf
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/vitubiwes.pdf
    • http://fijubigatusurov.scienceontheweb.net/jetovinesededubajupev.pdf
    • http://pay-order.info/komanewanivenf4ac.pdf
    • http://idealica-official.website/junizivafuxijusoof1oy.pdf
    • http://rexonina.medianewsonline.com/autobiography_of_nelson_mandela_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://livirava.atwebpages.com/jumitosanusov.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_off0000fbe9.bin
e59b57aa13a66914f79522f393e25c29d168c0ea766bef77f150dfa9bede1a38
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 5144 bytes
font_01_sfnt_off00010d6a.bin
f2047e9842d054f99fa64cbbf21ab97b1fe2e22f8599467c0297bdcc0bddf4e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 10600 bytes