Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42b5132e86d9cc7…

MALICIOUS

PDF

72.8 KB Created: 2020-11-25 05:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d56cff4d7011f360a2d387a80e62dee7 SHA-1: d88447bc5dea2d54d0ed3564de1aa92b41989f46 SHA-256: d42b5132e86d9cc7d3eaf771bc9af992f46f0368a5baa71b9200becce89e7133
156 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. 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 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://trafffi.ru/123?utm_term=double+integral+calculator+spherical PDF link annotation
    • https://bivupiduxod.weebly.com/uploads/1/3/4/6/134664268/764de5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_5fa44744de9db.pdfIn PDF document text
    • https://bovaromekefa.weebly.com/uploads/1/3/4/4/134403346/12a599878e58a9.pdfIn PDF document text
    • https://lamekibig.weebly.com/uploads/1/3/4/6/134652122/gozopezatapesizugok.pdfIn PDF document text
    • https://nolomiwasuwizug.weebly.com/uploads/1/3/4/6/134661688/16720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_5f982a345e6cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481162/normal_5fb48bc8b8024.pdfIn PDF document text
    • https://nolalitikobuno.weebly.com/uploads/1/3/4/7/134768790/5057524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_5f94b5adc57aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_5f8b3580e1696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454426/normal_5fa94b2c8429e.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/rotowan/zipimapudimorenuwabiki.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/64657598738.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/gelutakigikoxonoxetepemu.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_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 5332 bytes
SHA-256: 9a2674422e458cb269c297c233f1d201de0eb51997b32e881cbb48f0e58a5cc4
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10388 bytes
SHA-256: 268f4f59e2616dca42c3bbc616cf7cf149a6511815877aa55fb5d69ffc8865e2

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