Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35b47be4b5f4f8d…

MALICIOUS

PDF

75.7 KB Created: 2021-06-04 04:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fccb6aac0dedb4ffa728225e3c837b42 SHA-1: 588bda8e0c007157062efd6ad9be1fe4f9c42de1 SHA-256: c35b47be4b5f4f8d0c0dfd96b6569e28ad58d61b7bff8a5a0ab0d6b7446c58ee
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 0.9998

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://pistant.ru/pbw?utm_term=formato+reporte+de+da%25C3%25B1o+a+equipo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385415/normal_6013c507cc72c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5feb5504801c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421335/normal_5fe3811526c0c.pdfIn PDF document text
    • https://nagofojog.weebly.com/uploads/1/3/4/5/134586362/5680299.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/tojelimuzaf-wixax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5fc948cd4389b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5fff30908a36b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_5fd8d0c65c8e1.pdfIn PDF document text
    • https://kojulijorivo.weebly.com/uploads/1/3/4/3/134329781/2388749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450636/normal_601293a6a2608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5ff1595b4d1af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450628/normal_5fcb2c0ea968d.pdfIn PDF document text
    • https://zegotasubevit.weebly.com/uploads/1/3/6/0/136097081/tipivinat-ruwuk-pubudafuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473403/normal_6008cc7f4dba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457000/normal_6013a8a3d50cb.pdfIn PDF document text
    • https://gixejeti.weebly.com/uploads/1/3/4/3/134326891/819a12a67d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403560/normal_60afee3b161b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 4964 bytes
SHA-256: fd551189f4cf6262457220e777e43d417617748633ab38fc46b0382e6a4dcfa6
font_01_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 11664 bytes
SHA-256: 1923b60c782abb2f93cc6cb6937fca0f74dfeeed012ce46f4226934b40218d56
font_02_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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