Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc7a5fbabb5e1db…

MALICIOUS

PDF

63.3 KB Created: 2021-02-24 14:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4794b34b7206cb5bdb8953ad6ca77535 SHA-1: 511b151b00bee22a2b93ce997bb44702273655aa SHA-256: dfc7a5fbabb5e1db9928a482b0b2ecad2fa0bc6ccdc0e8684113f8194b631cec
156 Risk Score

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://jottigo.ru/strik?utm_term=power+electronics+engineer+salary+uk PDF link annotation
    • http://shop-you.xyz/hp_officejet_5510_specsv1673.pdfIn PDF document text
    • http://zubiki.top/diwenakegorubuvovurikodcamem.pdfIn PDF document text
    • https://sojanonef.weebly.com/uploads/1/3/0/9/130969598/wabat-sopip.pdfIn PDF document text
    • http://onlinetyz.xyz/ramuluzetiwomexagitizekzipnv.pdfIn PDF document text
    • http://gsmall.space/9429114360aj0va.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/volamutemorug.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/dhdTANW/44588839816.pdfIn PDF document text
    • http://dimax.website/developing_interview_guide_in_qualitative_researchckcag.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuxedodi/igg1weQ/kebogipokowetobopujot.pdfIn PDF document text
    • https://gesovomovo.weebly.com/uploads/1/3/4/7/134716395/finibikawupinof.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/fopalew/5433788986.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/78436457876.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/masefijimukobivefupefonom.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/bleacher_report_football_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/legururopilawusukabi.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_off0000b881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB881 5224 bytes
SHA-256: b5e700d83c343fe1fd2c6c1ccf8d47d069553d6a4bbb3551f9f0e75cd3f398f5
font_01_sfnt_off0000ca74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA74 10668 bytes
SHA-256: fb87622858104acd2de83745110e5de3221fb8981ef70037147c84490198607e

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