Malicious PDF — malware analysis report

Static analysis result for SHA-256 5459f7e1815e9795…

MALICIOUS

PDF

99.0 KB Created: 2021-03-04 06:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1e1d7d70194c590255e4743f14d2c65a SHA-1: d0c153c80d72db3c56c91df5f9434720e4df399b SHA-256: 5459f7e1815e9795c4ddda89d23e440a0a4fc7c3cc17bd74f6e1f2caf0e404da
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically mimicking a search result for a popular book to entice clicks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest malicious intent, likely leading to a phishing page or a download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/123?utm_term=how+to+quit+smoking+book+allen+carr PDF link annotation
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/b0e63ddf0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374983/normal_6005b599ed0b3.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/80663423182.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/80398130199.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/vitobulegugelanejape.pdfIn PDF document text
    • http://ronefed.iblogger.org/grade_4_maths_subtraction_worksheets.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/is_cbd_oil_legal_in_ncaa_sports.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_602750b1c42fa.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/jowupesanul.pdfIn PDF document text
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/1eed90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_603901b70bfd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5fcbd15342c3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379719/normal_5fe1c0ab9a7d5.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/journeys_grade_4_practice_book.pdfIn PDF document text
    • http://kusulapezep.iblogger.org/xezageviwutorigirametori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vepuguda.rf.gd/nunaduvumula.pdfIn PDF document text
    • http://dudakitulefuteg.rf.gd/the_monkey_king_1_watch_online.pdfIn PDF document text
    • http://gosigolixadi.rf.gd/b_b_s_ka_full_form.pdfIn PDF document text
    • http://duvufewitopemaw.rf.gd/30507607458.pdfIn PDF document text
    • http://dujepuxa.rf.gd/54621478243.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/is_miles_morales_the_best_spider_man.pdfIn PDF document text
    • http://vipaviveza.epizy.com/sonic_all-_stars_racing_transformedtm_demo.pdfIn PDF document text
    • http://nosijatigatu.epizy.com/macmillan_mathematics_4a_teacher_s_guide.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_off0001467a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467A 5500 bytes
SHA-256: 968f6900838c6525170e3686e7e2b420ec054d21e7b78d48b1376ce845131f7b
font_01_sfnt_off00015931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15931 10928 bytes
SHA-256: b2935b101de5b079a346f53a8811633bd206beaf9300716d2fa4d4b920e55c98

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