Malicious PDF — malware analysis report

Static analysis result for SHA-256 7616b79d13204725…

MALICIOUS

PDF

76.0 KB Created: 2021-04-06 16:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a061db8c3f91262c52fa3a4cc94e57ec SHA-1: 9ca267eb2539d3e277fb6b17db7dd5b0a859348b SHA-256: 7616b79d132047251e24d9a740b3a75bf103d4283f266d951bb5a0dc74ac6349
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://soxebez.ru/award?keyword=the+angriest+boy+in+the+world+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469353/normal_5ffd3cc21fa04.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/affichage_obligatoire_2020.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/3ca26a020a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5fd2d77f7b5b0.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/tofixufebojetiguvuf.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/resumen_del_capitulo_1_de_la_riqueza_de_las_naciones.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/23238170501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_c1e04c08d23641f9ad6c681a7b57c0ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/richmond_water_heater_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/bifuripu.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/14258018555.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/27604365228.pdfIn PDF document text
    • https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_2a107c863c5641b5b8b031103342e913.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/brazil_serie_a_log_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/letter_v_worksheet_for_kindergarten.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/kekotalavotutoko.pdfIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_f8da2224b1794437b0df1a59bec23ea1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/javesemoxofalo.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/fosufisatoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/81248191394.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_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 5648 bytes
SHA-256: eb969cd2132d463a85ac00549ae08b85678f7cf8a57377c9530989590eb91199
font_01_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 11176 bytes
SHA-256: 98462d415a57eae057bec8e28936589697e5e3210596c703422fe289f0d4e7c0

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