Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bbcb4336584c3a…

MALICIOUS

PDF

73.3 KB Created: 2020-11-11 05:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: be78391568b597f2435a26856f2160f7 SHA-1: 9dee89554cf468ab1e1444279062d505cb775a89 SHA-256: 80bbcb4336584c3a7b684c65de7c54fbe31d1a6e87813c1e1ee6f2bcbd5d34b3
196 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. It uses a password-protected-archive lure. 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 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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?keyword=navegadores+de+internet+leves PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f8d863ad1da2.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/sejonopulefifubas.pdfIn PDF document text
    • https://jazexupojofon.weebly.com/uploads/1/3/1/4/131409098/4517362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_5f93a53f83ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5f98f80f1c0f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5f9c2485668f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f99e6b579272.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/wopevoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5f8c14f4b26ec.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/vaxebisapesi/sikikoxet.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/bed_bath_and_beyond_manual_meat_grinder.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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 5020 bytes
SHA-256: c1244a2151108c180cd1c184f6a4c67386d819bdba7cb8c7695b1cf26a80ad0d
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 12076 bytes
SHA-256: c4f15a1dcb4737df13ae61204b9c5de5df96123dd04476250b134200793f4009

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