Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f03fd65c1471be…

MALICIOUS

PDF

72.2 KB Created: 2020-11-14 10:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5843e930f59fcc7109c57916b9c82e9a SHA-1: d3a3b96bb6c61744a15451ff8e93a7dd7bafa219 SHA-256: 24f03fd65c1471be7b98732f004a00c51fadc0723363640e7ecdd4c09bf4bff4
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 0.9998

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://traffnew.ru/aws?utm_term=esc+guidelines+atrial+fibrillation+2018 PDF link annotation
    • https://lorinifufa.weebly.com/uploads/1/3/4/3/134357706/fexazarem_rugipufowelovag_duwogolupalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f9b6a8b3de76.pdfIn PDF document text
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/bujot_kokajexodejemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_5fa540720feca.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/norozovijalu/85588597033.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/gabowivulikaduxesubez.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/90039539646.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/vapafugelofutote.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/49836033329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9b2f1b-a2aa-4e9d-a373-a6532e582e94/katujolukuvexax.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/saritaxanonigixakem.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/que_es_biodanza.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/pre_calculus_12_textbook_mcgraw_hill_ryerson.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/vomutobabe.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/wemafelukovenobonol.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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 5804 bytes
SHA-256: 6d7139420a4bb3e02dac1252c2c0ce2689f393799c65dec9365f3626e498792f
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 10312 bytes
SHA-256: 2b54c11d014410fad435480bdbefbaa69b735d8d3a7e7fd32727f19ee178f472

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