Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19267e490549b87…

MALICIOUS

PDF

81.6 KB Created: 2021-02-25 15:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d6b9f7ccd93f758ec0f77c08bb2827dc SHA-1: 344735fd49c5ba0f332fbcbc48f9f3a4afae0b24 SHA-256: d19267e490549b877385965f305ef5100b44b6c168ca00b316beed913e4eb013
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL `https://jacksth.ru/strik?utm_term=international+s1700+specs` is likely the primary lure, directing users to a potentially malicious site.

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://jacksth.ru/strik?utm_term=international+s1700+specs PDF link annotation
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/f2bb980.pdfIn PDF document text
    • http://tevfikyuce.xyz/lisegowunagagurnedhd.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/dopefotaweli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fe601acb3260.pdfIn PDF document text
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/muvokanazefibinodofi.pdfIn PDF document text
    • http://christinaanddavid2019.com/zijenifajebexagejugapubuwstuo2.pdfIn PDF document text
    • http://topcreditreport.info/277970895941afm8.pdfIn PDF document text
    • https://jefupijoban.weebly.com/uploads/1/3/1/4/131437873/649c00a10fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_6024ab3796053.pdfIn PDF document text
    • http://uaregroup.com/voxisqmsax.pdfIn PDF document text
    • http://avit0.pro/five_nights_at_freddys_3_song_lyricsmwo40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_601df9c7a4459.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/temujonuwu/challenging_behaviour_care_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/dotudinevoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/58807236413.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/jiwotafu.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/72477688087.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/37376663540.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 5136 bytes
SHA-256: 33de07ea5a03ecea33febed1036add0303e002a12c7530ba88fdd3daa3cece65
font_01_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 10588 bytes
SHA-256: 031e843667110f48b1d0f0d40432d4953569f03cb6a7cc1106280d503afbd48e
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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