Malicious PDF — malware analysis report

Static analysis result for SHA-256 89811b83c2247208…

MALICIOUS

PDF

78.6 KB Created: 2021-04-05 01:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1166b40f5b60be57c4c50cd8c574df57 SHA-1: 9eb651ad310b26190f17f50580ab23bbc43e5041 SHA-256: 89811b83c22472085d577e8b2f185fbc3af12180d9a56dd69b8ba303bb382fcc
126 Risk Score

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 0.9996

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://vilenefex.ru/strik?utm_term=how+to+fix+a+jammed+paslode+nail+gun PDF link annotation
    • http://bbbbbbbbeeee.space/el_islam_significadootexe.pdfIn PDF document text
    • http://fofafik.iblogger.org/ruxesugazemiga.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/kabaxumijumuv_jobesekas_vijerusexebipuf.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/everything_i_have_never_told_you.pdfIn PDF document text
    • http://nepojar.22web.org/50261792110.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/35762868273.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/basic_english_worksheets_for_spanish_speakers.pdfIn PDF document text
    • http://refazali.mygamesonline.org/81453663694.pdfIn PDF document text
    • http://vutanari.22web.org/applications_of_discrete_mathematics.pdfIn PDF document text
    • http://energytik.net/sed_and_awk_tutorial0g5pp.pdfIn PDF document text
    • http://idealslimitaly-official.site/litokadisorafuxuxawazolwlor1.pdfIn PDF document text
    • http://najisemure.medianewsonline.com/pawofidubewawolufamefi.pdfIn PDF document text
    • http://iqecoportal.ru/kavofogiluxapomone5.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/76356370576.pdfIn PDF document text
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/7295623.pdfIn PDF document text
    • http://smartradiobf.ru/movagowinunmmzq.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://jiwodiw.myartsonline.com/62862362030.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/gupowunarogizas.pdfIn PDF document text
    • http://navibizo.rf.gd/wuwudawunufazumexepov.pdfIn PDF document text
    • http://dejugatifug.rf.gd/ayatul_kursi_in_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/48812536494.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_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 5344 bytes
SHA-256: 3581b5b05e53e5565d11bbefebfc56ef06c1aabc88c3aece389309d947760ae7
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 10668 bytes
SHA-256: ddfc4e758c73bdcd583dfb4181031267df3deff133287c9c9d4cc2542dee080f
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361