Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e81c82160e43783…

MALICIOUS

PDF

75.2 KB Created: 2021-02-11 07:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b1c61015d4d9927000ff3656a3efb453 SHA-1: 41f9ea60683425314d0a37e61d5504c27a9b3572 SHA-256: 5e81c82160e43783557e9771b5a077e7865fa23bae7bc155697fecf33d9e654d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are identified as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely to download further payloads or phish for credentials.

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://baarspo.ru/123?utm_term=what+causes+day+and+night+on+earth+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369305/normal_5ff772286331f.pdfIn PDF document text
    • http://pressit.space/13265657349b6ep3.pdfIn PDF document text
    • http://alkostore.xyz/terraria_asgards_valor6natv.pdfIn PDF document text
    • http://ttttrrrr.space/zetumopepifatiselu3h6kf.pdfIn PDF document text
    • http://lonagonem.22web.org/facilitating_learning_a_metacognitive_process_answers.pdfIn PDF document text
    • http://excellent-spb.ru/extent_report_4_jar4snoi.pdfIn PDF document text
    • http://xplaintome.ru/puzodoluwajemavakibeunw5l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_6018524f1628a.pdfIn PDF document text
    • http://igme.site/76447176990crdsj.pdfIn PDF document text
    • http://tonagruz.ru/autocad_2018_macaad0y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410443/normal_5fe43082cd3c9.pdfIn PDF document text
    • http://goloszauniver.fun/nasamakejemozusaymghe.pdfIn PDF document text
    • http://sellforce.ru/performance_comparison_chart38f8e.pdfIn PDF document text
    • http://freedate18.xyz/pathfinder_dpr_olympicsezqdr.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
    • http://legofovivaxom.epizy.com/65457945236.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_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 5320 bytes
SHA-256: dc55c1b577e8e710919cb5c002f22a8fb6d1cb3c64d9c127672ebf90b1730593
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 10596 bytes
SHA-256: 0141d384545369d28e6dd13b6281faaed142bbbd8740137e58ea8182f68c0746
font_02_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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