Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f4dcd47e98045f…

MALICIOUS

PDF

81.4 KB Created: 2021-01-31 09:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ab5e59af6e40d5bf19f0a6c710770851 SHA-1: fc42667c125a1d98c3b1bb9cdbee0256a86b3414 SHA-256: 33f4dcd47e98045f5b05a28135cb550881c5bb46fe6403dcc663b4518512c68d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

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 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://trafffi.ru/wb?keyword=3%20ply%20face%20mask%20made%20in%20usa%20washable PDF link annotation
    • http://mirror-x.org/wuxefoxajorakikajemaz2rjm.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/gobezosunowajukofu.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/f4gcgjY/70230296854.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/Mihsifn/bufixevuzodijiludenedi.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/gohjgBZ/82628984031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487201/normal_5ffd0d7fa913b.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/gijbyCy/slot_car_trucks_for_sale.pdfIn PDF document text
    • https://gawugabel.weebly.com/uploads/1/3/4/3/134361726/lejipopejibi.pdfIn PDF document text
    • http://flathead.us/fipisujetululk64ce.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/1982321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/scared_of_the_dark_song_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/factoring_by_grouping_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/kasapudetuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/ielts_test_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/free_printable_alphabet_formation_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/lagu_terdiam_sepi_nazia_marwiana_planetlagu.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_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 5764 bytes
SHA-256: cf70931b048adc0402af436c14526340ada90e5ef2e12c055d2f83a919f9e6e6
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 12128 bytes
SHA-256: a39e8483ed7431d69fdd8b2833511bc117ce28544dff4bf0d21a14abf27cbe6c

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