Malicious PDF — malware analysis report

Static analysis result for SHA-256 b224528878f0ec13…

MALICIOUS

PDF

75.4 KB Created: 2021-04-16 07:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 63ec343012c861d9e87c7fa00a62aceb SHA-1: de63376d19e6394eaa2a65ee47424eefcda8b03b SHA-256: b224528878f0ec13dfbbe3e194d7b972ebbfe90377e5554ac25fe52d19a02c43
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://resalured.ru/strik?utm_term=how+to+read+a+vacuum+pressure+gauge PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469365/normal_6048a75fa48d1.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/h55aidG/8410827313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392860/normal_6033a3ed20b9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5fe097d61fcc4.pdfIn PDF document text
    • http://dududuw.mypressonline.com/good_books_for_12_year_olds_boy.pdfIn PDF document text
    • https://cdn.sqhk.co/jilelemo/dEhdMp4/vesepudivekusawigep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5fdfaa96b889c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_6012091e4f97f.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/jih3vhb/ice_cream_roll_shop_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/1BhahcM/rupusidewebevifumo.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/vigoxoxubizuzeguj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481403/normal_5febb529aa1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_605312927cdb6.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/jubojojejaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lusajafimaneru.myartsonline.com/hells_vengeance_maps.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/samsung_washing_machine_repairs_sydney.pdfIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_e5d9c6712a424fd786b329d47798ad64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/52547399592.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/how_to_crochet_socks_for_adults.pdfIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_ffe27a1aa8874a95b37380712e318062.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/10882840610.pdfIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_f61888b409794c5bba1818f080ef5a78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/korukinov.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_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 5476 bytes
SHA-256: 2c18408e31293de4426364492263b08d1a93b5b13113b5d6aa1c1fd100b04d17
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 10360 bytes
SHA-256: bea19416beb2ef2b103b9d6a1a5a7e32970187ae1c2c9e4b64e88eec0c15a9eb

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