Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c04fff65272a06d…

MALICIOUS

PDF

76.2 KB Created: 2020-12-07 01:22:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0bebf55d645999f00f13d11754a837da SHA-1: d8619a06476bc047259731a150c1d8a9507058f5 SHA-256: 4c04fff65272a06d0d31332a84efa18f370b2bbf893fe8124e47a85fc9f95e1c
186 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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/123?utm_term=christian+christmas+poems+about+jesus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5fbcf8067bdd7.pdfIn PDF document text
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/8579227.pdfIn PDF document text
    • https://devigumekumowir.weebly.com/uploads/1/3/4/3/134394761/didoko-zidoda-lodobo.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/dipipob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_5fbc5b41927c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5fbb511aa9682.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5f910173bec57.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/ecce1.pdfIn PDF document text
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/giwonowitut.pdfIn PDF document text
    • https://gozisali.weebly.com/uploads/1/3/4/6/134670052/1509144.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/b8c9409f-d195-49ec-ae99-c0e99513f354/nakif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 5264 bytes
SHA-256: a964968f6aca327742e35d93943e17d86cba4e17ab96ed0c6519d8e1337e55a4
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 10988 bytes
SHA-256: 5f31187a3e1ddda31d695495467fecd1a3779b3afa03e4cd5f5c0570f5ce867c
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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