Malicious PDF — malware analysis report

Static analysis result for SHA-256 733cfa76d35e14ff…

MALICIOUS

PDF

87.5 KB Created: 2021-02-10 00:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6c9d4f0918a0e57884aedc7bf74ee104 SHA-1: ada920355fd5aa12dd43d2573701e107a0f05834 SHA-256: 733cfa76d35e14fffdb95a0d4eef38d88d7a160ddda6fbc276c12b7da3167aa6
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a potential redirector (`https://jacksth.ru/aws?utm_term=caumsett+state+park+fishing+report`). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, a common tactic for phishing or distributing malware. No scripts were extracted, but the presence of numerous external links points to an attack pattern involving redirection to malicious sites.

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://jacksth.ru/aws?utm_term=caumsett+state+park+fishing+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387932/normal_60184b5834c65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5ffb2f545b62e.pdfIn PDF document text
    • http://dazemuwemez.22web.org/18543507386.pdfIn PDF document text
    • http://imm-shoes2.club/lucky_block_minecraft_command_1._1477088.pdfIn PDF document text
    • http://rollernefritmassage.xyz/532455624661r6fg.pdfIn PDF document text
    • http://replyua.site/ragajesn8gp.pdfIn PDF document text
    • http://hangookoil.ru/19541420768mj7p6.pdfIn PDF document text
    • http://korsabarca.com/bartender_software_manualy126z.pdfIn PDF document text
    • http://fruit-citrus.space/fish_lips_kiss_heel_gussetjpec0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zomekijisev.rf.gd/communism_socialism_capitalism_worksheet.pdfIn PDF document text
    • http://waroxudon.epizy.com/ypf_gas_formosa_telefono.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/casualty_feeder_card_form.pdfIn PDF document text
    • http://zubafazebet.epizy.com/kutulo.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/jurapu.pdfIn PDF document text
    • http://pidelusinurak.rf.gd/pune_via_bihar_movie_song.pdfIn PDF document text
    • http://dobifagamuwu.rf.gd/46156504264.pdfIn PDF document text
    • http://kekunulu.epizy.com/grey_bed_sheets_kmart.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/75271464648.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_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 5252 bytes
SHA-256: e3c61302565e0b9d0a0af824e8b1d519ad00da0d041da7ef61d7d1697f18a80a
font_01_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 10652 bytes
SHA-256: aeba12541309809cd7cea0bf390319dbd71f6d21b8c309766f7912572389cb89

Open this report in the interactive analyzer, or submit your own file for analysis.