Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df489c2e87431f1…

MALICIOUS

PDF

83.0 KB Created: 2021-02-14 08:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: eb1e88df95989cdeb1f13328b59cf784 SHA-1: 45ff08f1c45466239fb5c1cec014fdae616ca0e2 SHA-256: 2df489c2e87431f1b17c67afb026c497692b374b57407094e2865a3ce353ede0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of external links, many pointing to other PDF files, suggesting a link farm or phishing operation. The primary URL identified is https://jacksth.ru/wix?keyword=this+is+how+revolts+start, which appears to be the entry point to this network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=this+is+how+revolts+start PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391909/normal_600bc5c18c116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5ff4fe3cd36ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5ffbca62cfe6d.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jfifHii/taxokoxovota.pdfIn PDF document text
    • https://venefenotufawu.weebly.com/uploads/1/3/0/7/130775800/9531930.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/rivivomejes_bipufawesefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_601b128d938b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_5fd1f18b31f23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5ffa4d549fb75.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/ibGYJZZ/nisatuwutividalaxip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_601df9fb90cda.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/Nqvnhbw/65405109989.pdfIn PDF document text
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/sesopam.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/JEgi4TZ/graal_online_zone_hack.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/fibesezati/brown_dust_beginner_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 4872 bytes
SHA-256: 01d6c80d1be45dbebb157726118b7b4073e05d8fe52a3bdea54c6a0dfb08838f
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 8540 bytes
SHA-256: 40387e62e8853569fc4a55eb509a9e220e94cd7666f3dc1d2c9b4d1b9cc98bee
font_02_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 12312 bytes
SHA-256: 2daed9cde543e084672e5c9906020392dd29d98c78eb0d57dacd6144df414dc6
font_03_sfnt_off00012881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 16264 bytes
SHA-256: 06b6d92114adeda75af3f96122d26ce5b75c0c67043a3966fe4e60826377f072

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