Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f8fe56515f433c…

MALICIOUS

PDF

77.8 KB Created: 2021-01-08 03:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f5458df3e45009be92bfc03f09995234 SHA-1: b21e4b1d34ecd07e4fb81c40135f6188af17a914 SHA-256: 43f8fe56515f433c1ed47a9a52566b41294589d8019a37c51381d4aa0a5e9bdf
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-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=world+record+largest+domestic+cat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5fc54508d1e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5fd17284bfc91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_5fbf8681332b0.pdfIn PDF document text
    • https://mijujatojiso.weebly.com/uploads/1/3/4/7/134701577/suzavutobav-tonusewumemimip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474719/normal_5fef42034278e.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/4237687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5fea16efade56.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
    • https://uploads.strikinglycdn.com/files/8668b8eb-2524-46d4-abb2-0feabbef7600/jamman_solo_xt_looper_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/numeros_primos_e_compostos_exercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6908156b-e41b-4d88-9a84-1df59aa59aff/godowujodigawanuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0a38be-2b41-45ce-a861-3e1375c0dd1a/how_to_install_salts_on_kodi_krypton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd498c4a-c5f9-4e0a-98c3-271355539071/10961275510.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 4952 bytes
SHA-256: 8c1c076113a091fb6120e890cb4f332c8f893ba2ae7a4ccb439a6d87cac20eec
font_01_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 10788 bytes
SHA-256: 6d29def768395905f07e7de2f32c0f62cc725ac9567fde5f40bc485c8084d280
font_02_sfnt_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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