Malicious PDF — malware analysis report

Static analysis result for SHA-256 425f4e3c765688be…

MALICIOUS

PDF

78.8 KB Created: 2021-02-23 04:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a09a120b657e18604ce49d6b8321428 SHA-1: 66184195357ee776428510454925e90ed102e20c SHA-256: 425f4e3c765688be52ffe0ff0def918963919cec24d05d62d20949805a2d602f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=what+is+the+best+bible+reading+plan+for+beginners PDF link annotation
    • http://everydayy.fun/autonomous_vehicle_sensors_conference_2020h2rfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454171/normal_5fcdf5378b8cf.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/hdmig71/lowujudes.pdfIn PDF document text
    • http://extraterrestrials.space/jidafipezurewedipixukifdetz0.pdfIn PDF document text
    • http://ighelperscenter.com/xukojafiripkeub.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/bfa77869b4f8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485587/normal_5fce9b3c08ac1.pdfIn PDF document text
    • http://tranquils.space/59089778233i4lka.pdfIn PDF document text
    • http://derabaxudofofo.22web.org/smart_wristband_s2_manual_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465149/normal_5feb5f032a51d.pdfIn PDF document text
    • http://jotipire.iblogger.org/church_flyer_template_psd_free.pdfIn PDF document text
    • https://sekojeti.weebly.com/uploads/1/3/4/5/134583019/1823463.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
    • http://matiwusaned.rf.gd/zepapororedidikaro.pdfIn PDF document text
    • http://nasobozavas.epizy.com/wallpaper_bunga_tulip_putih.pdfIn PDF document text
    • http://fufibilola.epizy.com/critical_appraisal_worksheet_systematic_review_meta-_analysis.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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 5244 bytes
SHA-256: 4c4e99b356d1f40f2e3b68ce5a7640d66d98aff5a6f4c263b3f9d6c511aa2005
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 10312 bytes
SHA-256: 9c2e31043223840e135a1db7722b986a6f88d947fe87303b7338cb94374b9440
font_02_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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