Malicious PDF — malware analysis report

Static analysis result for SHA-256 a263e99c5c1a407b…

MALICIOUS

PDF

73.9 KB Created: 2021-06-01 09:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ae28171ced67cbd5b05d7ad1e1afa0 SHA-1: ba73f16967df4bb4211657052cf00fc0a36fe453 SHA-256: a263e99c5c1a407b808036961f00897a82594b5b53c968b5711b9369daaee254
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is also listed among the extracted URLs. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a game ROM, suggesting a lure to a malicious download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/pbw?utm_term=just+dance+greatest+hits+wii+rom
    • https://lugekovatisemo.weebly.com/uploads/1/3/5/3/135337030/julov-vekupoj-pofepizulezom-foxovutil.pdf
    • https://bodonejuw.weebly.com/uploads/1/3/4/6/134686214/7acb06127a6.pdf
    • https://static.s123-cdn-static.com/uploads/4369919/normal_60032110d75fa.pdf
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/cdf793597ef1d2.pdf
    • https://cdn-cms.f-static.net/uploads/4466173/normal_602e842b32b9d.pdf
    • https://static.s123-cdn-static.com/uploads/4478927/normal_5fefcbcf0dc24.pdf
    • https://static.s123-cdn-static.com/uploads/4368489/normal_5fc5fa8ce30e9.pdf
    • https://cdn-cms.f-static.net/uploads/4366366/normal_602a35b34810a.pdf
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/degor.pdf
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5ffa04ac64beb.pdf
    • https://cdn-cms.f-static.net/uploads/4407988/normal_6026585995755.pdf
    • https://cdn-cms.f-static.net/uploads/4371498/normal_6060107220cf7.pdf
    • https://bipagaposelugi.weebly.com/uploads/1/3/4/4/134479594/medavozudetug.pdf
    • https://cdn-cms.f-static.net/uploads/4421201/normal_6052e9c457c0e.pdf
    • https://static.s123-cdn-static.com/uploads/4410013/normal_5fcd26e5342eb.pdf
    • https://cdn-cms.f-static.net/uploads/4501963/normal_604e68dab1bad.pdf
    • https://static.s123-cdn-static.com/uploads/4379030/normal_5fc9938d2aa1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b19dea56-3d47-4d66-b525-572a756e4eb7/fervent_by_priscilla_shirer_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/ce941f11-45d8-4880-b995-a07cc1a4d866/using_context_clues_to_determine_word_meaning_worksheets_high_school.pdf
    • https://uploads.strikinglycdn.com/files/187fe9a7-9c33-45ba-bea9-4df8e0ca51ba/6837035150.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144418524/nudexumu.pdf
    • http://palixazoke.pbworks.com/f/judgement_ps4_batting_guide.pdf
    • http://venatulafiz.pbworks.com/w/file/fetch/144425676/novio_por_una_noche_online.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_off0000df56.bin
f372897191d844de6cd0cf6f088b7b7ec0cddc386a0c3e450203f04fba7f8b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 5400 bytes
font_01_sfnt_off0000f19a.bin
802ab10d839b35689b0a8992135ac54b269c38d4be778a6e0d489e5e5f43e5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 12464 bytes

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