Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bf8b8117c23f83…

MALICIOUS

PDF

74.3 KB Created: 2021-02-22 07:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e016aa1c92991d76684aeb688e3d5f14 SHA-1: b4c90d7a24e9dc9cf780ae12798d11b5c1395890 SHA-256: c7bf8b8117c23f83dbac2719eb1b68a55f80f9d6ef070c246bcf392563b2dfb0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged by ClamAV as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to a 'Jedi tunic pattern pdf'. The presence of multiple disposable hosting links and a link farm heuristic indicates a strong intent to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/wix?keyword=jedi+tunic+pattern+pdf PDF link annotation
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/wikurubewuzawe-dukoluzowep-wokofadebe-moxodezosadipe.pdfIn PDF document text
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/tewozefizubexoz_bulexebaf.pdfIn PDF document text
    • http://compte-cmbretagne.best/28399681015yajf8.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/iajjgjQ/88467612680.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/SgiiaB9/download_cal_bank_mobile_app_apk.pdfIn PDF document text
    • http://prequester.online/34669841072ffvtb.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/niighij/falewidokalasunojadul.pdfIn PDF document text
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/839048.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/dadgad_chords_celticu8zuq.pdfIn PDF document text
    • http://reactivaperu-2020.com/866911250638gzko.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/pakanoberi.pdfIn PDF document text
    • http://pshcomonhere.xyz/nurizogusaguvi4eug3.pdfIn PDF document text
    • http://citruss.space/how_to_remove_pimple_marks_in_hindi_language12sfh.pdfIn PDF document text
    • http://dhl-order.info/955218693075izzb.pdfIn PDF document text
    • http://sun-italy.space/coffee_day_global_limited_annual_report_20175dl8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/introduction_to_biblical_counseling.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 4700 bytes
SHA-256: c452bb3afbccfeb93387f97195585547a12130a239e741962e59a261af61354f
font_01_sfnt_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 10496 bytes
SHA-256: de3fccbef06ef5d4741c2a214bf4419717b0ff905c78483a796f640306a54028
font_02_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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