Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b3f86a9832ff5a…

MALICIOUS

PDF

74.6 KB Created: 2021-03-21 12:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4236dc3bdba173599581c9630254b0f1 SHA-1: 104b409b9d736bafdd5d4e07294ebc2e40e04b30 SHA-256: 64b3f86a9832ff5aa2e8b5b300e3bb234a20f3bae1198c24e79ffc833c90b47d
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's content, while heavily obfuscated, appears to be a lure related to a textbook search, directing users to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/award?keyword=introduction+to+logic+im+copi+pdf PDF link annotation
    • http://metonufa.22web.org/7952566189.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jjfhXym/tuzubewasuju.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/ifNtxic/melodyvr_app_android.pdfIn PDF document text
    • https://fukajupiboxa.weebly.com/uploads/1/3/5/9/135973929/jumuditig.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/hggggiL/64919046083.pdfIn PDF document text
    • https://mizijuwewis.weebly.com/uploads/1/3/4/3/134392366/59a61519c3a72.pdfIn PDF document text
    • http://gavikaluruvakuz.iblogger.org/causas_de_acidosis_metabolica_hipercloremica.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/icjiRgh/8215214532.pdfIn PDF document text
    • https://cdn.sqhk.co/viliwogid/jwmi3jh/vopegawegibejogopir.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/RDnG35s/f_stop_gallery_pro_paid_apk.pdfIn PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/c6fdf153279f.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://gofirog.epizy.com/guided_meditation_sleep_asmr.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_770b7cd70e984879aa263912633a0a5f.pdf?index=trueIn PDF document text
    • http://vowajug.rf.gd/certificate_template_free_download.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_266be700f6f44be6b53d46cd9d3438fa.pdf?index=trueIn PDF document text
    • http://zapopododo.rf.gd/99691471694.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_9050ff23368844cea140753e2adba8ff.pdf?index=trueIn PDF document text
    • http://ninivekav.rf.gd/96422221409.pdfIn PDF document text
    • http://besipopi.epizy.com/anaconda_3_free.pdfIn PDF document text
    • http://intrologic.stanford.edu/publicIn 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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 4788 bytes
SHA-256: bb45f96bfa2b9f825b0297f5c3bc583718e95cb9488abdf2002885dec0a940a4
font_01_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 10760 bytes
SHA-256: 72407d6370c33bb510fc0e1de75fdc43132397a1bda9ee1f25741bcc40e2d26d
font_02_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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