Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fce2ef5e2b0dca…

MALICIOUS

PDF

91.7 KB Created: 2021-02-28 14:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4afc72ec887c7db2e16527dab39eb834 SHA-1: 36090d02ab680405c930fff00d1406dac8b68057 SHA-256: 40fce2ef5e2b0dcadbfb0b3011253e178a194a997f28e1fd51e2ae7083e46981
216 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. It uses brand-impersonation credential phishing. 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 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/nudan_jikexoko.pdf.
  • 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://vilenefex.ru/strik?utm_term=samsung+galaxy+s5+neo+tips+and+tricks PDF link annotation
    • https://cdn.sqhk.co/mafozerekat/5wijXnN/6291948051.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/ieu4iz6/photo_editing_app_for_android_download.pdfIn PDF document text
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/nudan_jikexoko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502336/normal_6003ebb036958.pdfIn PDF document text
    • https://jekunido.weebly.com/uploads/1/3/4/3/134312583/sikedifovupodinomir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501503/normal_5fc767df76edc.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/h3XYgfA/7521829246.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/jXd0Aih/lawoxivubugetirip.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/gggji0b/freehotelcoupons_com_tennessee.pdfIn PDF document text
    • http://trellos.fun/how_many_seasons_of_warehouse_13_were_thereh659d.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/dudujopixejikug/64470159789.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/connectwise_university_answers.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_off000129c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 5852 bytes
SHA-256: e57c0ff51dfdec7176be6fc5fc46fd33d4b7b0691859fbd6813b35515da3c054
font_01_sfnt_off00013dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAC 10640 bytes
SHA-256: 076636bf1032da3c390ff794b15a809b5f30bbf902dde0b4cb6f7eebb156be05

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