Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0489dcd9da6bdfe…

MALICIOUS

PDF

58.8 KB Created: 2020-11-21 15:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: adf31e9fa80b710e0061457390fcd854 SHA-1: 5e35ade229c22c297bb5b106e870a3eaf3b8bf45 SHA-256: c0489dcd9da6bdfef953120016a3c197bf59459e93c6a35feb948e86eee4359a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many of which are likely part of a link farm designed to distribute malicious content. The primary malicious URL identified is `https://trafffe.ru/123?utm_term=thank+you+ma%2527am+quiz+answers`, which is presented in a context suggesting it leads to quiz answers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=thank+you+ma%2527am+quiz+answers PDF link annotation
    • https://kamijiruwidezi.weebly.com/uploads/1/3/4/3/134387945/1182188.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/6641841.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/a7b88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f417540e-7c7a-46ed-978b-7cab75e8da9f/financial_audit_checklist_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/suwinavenizowojikaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe243214-5eef-493d-b533-5ce454ebbea7/jowetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11427484-e490-4882-85f3-16611fcef48e/23887436848.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/jilasibiganifidogikomov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5229e7b5-4d39-476d-a890-e5982fa56129/anna_university_transcripts_from_abroad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b87cf9-1852-412d-861e-428fc51929cf/seat_pets_malibu_monkey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83cfa87c-da3f-4210-a66b-a68bafc040ca/bagufiwibixexavides.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/fawevarep.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/47452781483.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_off0000acb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB7 5308 bytes
SHA-256: fd65b431dace2e3ac74e36687249d88c0158816b7220b0e9e3df6c74f04fc882
font_01_sfnt_off0000bec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC8 9304 bytes
SHA-256: df168e4a45bcef4ce094c5ef415c12faa8fc802276642edc7d3ecf92a9f46787

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