Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed30495a87767eb…

MALICIOUS

PDF

68.4 KB Created: 2021-06-01 18:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b58a41fb9fa8b86642b15941076dc08e SHA-1: 9f6272e07bfdb690132983ae676dfe944e610241 SHA-256: 3ed30495a87767eb1c51c7fab3201d03aed84cfb9f691fcb0ecff27c94ce1043
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 0.9997

Heuristics 6

  • 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.
  • 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://jacksth.ru/123?utm_term=guitar+music+free+sheet+music PDF link annotation
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/meguko.pdfIn PDF document text
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/rinobavefiv-kaluvubovoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_603b373833b18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_605bed8b7794b.pdfIn PDF document text
    • https://rinafudafize.weebly.com/uploads/1/3/5/2/135293322/1544196.pdfIn PDF document text
    • https://vuzirokisex.weebly.com/uploads/1/3/4/5/134576988/5cefdd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_5fda06abcb720.pdfIn PDF document text
    • https://teretusux.weebly.com/uploads/1/3/4/6/134687242/luxevukigusef-noloxiwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://munonoraze.pbworks.com/f/ejercicios_de_fracciones_equivalentes_para_cuarto_grado_de_primaria_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf89e1db-73f5-4d13-8fd6-35be3315da96/nugevanodozejaturuki.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144447417/81058927905.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/how_to_sync_jam_2_wireless_speakers_together.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_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 5120 bytes
SHA-256: b535562cfe746d6a253b22d61bcecfb5585415e38209575c0f6faf69a8f03f11
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 11000 bytes
SHA-256: cab3d4a5d46743e1ac53b7f28d54b4951fb11947e3e5c61ebd0820d3c78341db

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