Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d3445edb92c28c…

MALICIOUS

PDF

84.0 KB Created: 2021-02-18 10:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e36b40fc89161ec052b268d593f0e01c SHA-1: d7792372a400b9a171b924b5e5f5ed117e649538 SHA-256: d8d3445edb92c28c6527d52ae5f4506b95961ef576c876ddd5f6e8ae2249486e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF's structure strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=tutorial+blender+bahasa+indonesia+lengkap+pdf PDF link annotation
    • http://naturapple.space/maridimafuwny2tn.pdfIn PDF document text
    • http://naturaitalia.space/lejakegipuwoxufimosomi3vflf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485446/normal_5ff796cf9c980.pdfIn PDF document text
    • http://naturalgood.space/repiwifufcxst.pdfIn PDF document text
    • http://cloudmarket.website/gunshot_residue_analysis_methodaffot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_601b565aca54d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503791/normal_602247842919f.pdfIn PDF document text
    • http://lnstagram-office.com/boripadabetisofulewagovszjc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_60265400900ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402289/normal_5fce26b1c6183.pdfIn PDF document text
    • http://fitokaps.xyz/xedoxdcz5n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_5fd1651dc7f80.pdfIn PDF document text
    • http://makamar.online/ludigifemuxogavolynzyo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vajowevub.epizy.com/lepolifedixewi.pdfIn PDF document text
    • http://zifawikixeliba.epizy.com/l_glucose_chair_conformation.pdfIn PDF document text
    • http://fobunedofakane.rf.gd/2009_chevrolet_malibu_repair_manual.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_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 3724 bytes
SHA-256: f39b88084a6a692868195f39dd2d5c788655281ec7c0f8f1219019340c3b5e98
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 5456 bytes
SHA-256: 14c0d74ad001f81c83c9f3782e3f504a453daf13798e36c0e83e0065be3302da
font_02_sfnt_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 11176 bytes
SHA-256: 66949cf52c9f3bad0deab231069d8e0d71266eaa8b9b54cfc2f97e18f31f4d96

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