Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88995d619e261b0…

MALICIOUS

PDF

78.3 KB Created: 2021-05-20 15:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f250ca62156869388a1de6b356355140 SHA-1: 2361871a6ee2b7771bd4e44b9f4e7744d476d137 SHA-256: f88995d619e261b0c3e4aca8c17bd2c2c0cc8b37076016056afa7e57e4495f5e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. One of the embedded URLs, 'https://resalured.ru/strik?utm_term=fernwood+2+night+dvd', is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=fernwood+2+night+dvd PDF link annotation
    • https://seporulakokifo.weebly.com/uploads/1/3/4/5/134590723/gefelagamajete-mowilu.pdfIn PDF document text
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/nopaxowotokode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_6047f5f2d7312.pdfIn PDF document text
    • https://rutikaxa.weebly.com/uploads/1/3/0/7/130738846/88c0635ed4556.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/72d05edf9c1.pdfIn PDF document text
    • https://damozudi.weebly.com/uploads/1/3/0/7/130776403/9014167.pdfIn PDF document text
    • https://jagedebake.weebly.com/uploads/1/3/0/7/130738918/jigup_bepiwabofinaput_fizus.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/varaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420235/normal_601ce8d21d30a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420612/normal_5fd7973631a80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452171/normal_603c3d9636a0d.pdfIn PDF document text
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/tamezoto_tifibufigarik.pdfIn PDF document text
    • https://lobarogilipewu.weebly.com/uploads/1/3/4/4/134462863/kalojedumased-vawenexiz-bilal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc072bf-1b46-4e3a-9e7f-f74d2394a738/recaro_performance_sport_harness_to_booster_car_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8651ce3-95da-4a26-a424-a4996aa7eaa0/52723483900.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/wobakejekob.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/kimodulasiwonunanis.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/kaxiwafasile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea33544-cf1a-43c8-9b8e-64fa6af35c38/7th_grade_grammar_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/alpha_brain_waves_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/21225516534.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 4904 bytes
SHA-256: 0f583e940d701c41a117da9ff2f2ade607b1ab5a36a3a52ed3ae95bb713fc686
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 12140 bytes
SHA-256: ea18cb59cba59b1485a922b8ddf3fef7f30261b5b36d4314efa57f4a59b4e424

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