Malicious PDF — malware analysis report

Static analysis result for SHA-256 79575bd90dbd890c…

MALICIOUS

PDF

184.8 KB Created: 2021-04-03 23:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f20b2dbf261b80a562aaf4377632ec9 SHA-1: c81435e7aa4ee93416bd3e5ad460685192ec6496 SHA-256: 79575bd90dbd890c1d22b73113e6f0d9453a6895814d611c70770de88634e5ab
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the primary one being https://botokaw.ru/wix?keyword=assessment+psychological+disorders+worksheet+answers. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'assessment psychological disorders worksheet answers', indicating a social engineering attempt to direct the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/wix?keyword=assessment+psychological+disorders+worksheet+answers
    • http://daliadiago.com/why_wont_my_kenmore_dishwasher_fill_with_waterxb5f0.pdf
    • http://sipataj.sportsontheweb.net/68457112339.pdf
    • https://cdn.sqhk.co/tutabalero/jjujanO/la_telenovela_in_english.pdf
    • https://cdn.sqhk.co/murafabu/ibKhfvV/giwipusal.pdf
    • http://vereffka.xyz/classic_arcade_game_soundssiwhx.pdf
    • http://janipuwibir.mywebcommunity.org/revista_natura_ciclo_18_2020_em.pdf
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fdffff204065.pdf
    • https://cdn-cms.f-static.net/uploads/4470405/normal_605567b54186c.pdf
    • http://memowelubi.mygamesonline.org/95643566088.pdf
    • https://cdn-cms.f-static.net/uploads/4428334/normal_5fdbb35c21296.pdf
    • http://amandeepsadyora.com/fujudosefexaribolemosi0ypi5.pdf
    • http://hardcreditcheck.info/84101558537zgpxf.pdf
    • https://cdn.sqhk.co/dasisogi/UQjhPlU/traffic_rider_3d_lite_mod_apk.pdf
    • https://cdn.sqhk.co/loganidob/c7EZjhB/zogenawuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_3d409e4d7fdb4fb5b5f8325dd9c66fc0.pdf?index=true
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_56c152cd7965427e99d54b2fdfe5b354.pdf?index=true
    • 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_off0002971d.bin
25fce1a5cc1195d0783357f7fab21fa2f578ae01e1291b76013862bfb085c6a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2971D 5732 bytes
font_01_sfnt_off0002aa96.bin
cc2fc13134debf580f5d5f29de41997e07219bee3820813a68695801eacd0204
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA96 11952 bytes