Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd8dc180f815e3f…

MALICIOUS

PDF

64.0 KB Created: 2020-11-25 15:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d7b9d3369f78ac49e369df2f9641ba77 SHA-1: 1dad5fb444d576e58140009002cdb7b5ea8aa396 SHA-256: 6bd8dc180f815e3fd1e8ca9e2158d971eb9e16115bb8e00d0bbffb72940d0717
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://traffnew.ru/123?utm_term=electroplating+lab+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fb3d528712e5.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/telodefuv.pdfIn PDF document text
    • https://sesorefamasupuv.weebly.com/uploads/1/3/1/0/131071262/dc12ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_5f959ceb7e085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5fa4650ea5953.pdfIn PDF document text
    • https://vuwuvaxurig.weebly.com/uploads/1/3/4/6/134649086/wezuwumibozete_tulalu_vukuxuvefex.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/mokuwanibof/ririwabejoxutaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff5acba-8213-441f-ac48-ffba9427fd5e/spy_fox_wii.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/59973787925.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/music_appreciation_listening_guide_template.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/24889207884.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/33965315809.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/biological_classification_class_11_mcq.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_off0000bdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCD 5288 bytes
SHA-256: e07d9c0159808b683fcad90419aba890ba0336c18635f60ed628e40d71ccee6f
font_01_sfnt_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 9996 bytes
SHA-256: 8d3bcd0b640bdffd8682664f3fa3c50e6543f72571d767d6b47c1120add93cbb