Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd00878ca50ff3c…

MALICIOUS

PDF

73.6 KB Created: 2021-03-19 05:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a4a702812eefd80c5c8ad0f456abf4ec SHA-1: 7f058c33716a2ae2a93ff5f18cc9ac0f8c84e46c SHA-256: 9fd00878ca50ff3cd1da56e5ea886b2f19fd189904fb85af7617c2ff49058c47
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, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or spam campaign. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/wix?keyword=density+worksheet+middle+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449622/normal_603c37b4db903.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/zudafadum.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/head_first_java_latest_edition_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379960/normal_600761d2d98da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_60403d8a1d5aa.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/5703608418.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/buromof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_3de9b8fbdf6645f4ada98fb3e5e62860.pdf?index=trueIn PDF document text
    • http://kavibajegis.onlinewebshop.net/3368150559.pdfIn PDF document text
    • http://wenibeliso.atwebpages.com/kesifudogobaretuseb.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_9de06d1ca0914389b4598a39d3322ef8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/kavach_argala_kilak.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/rationalist_explanations_for_war_james_d._fearon_summary.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_03f8644d1d324fa3a13b372ba0f757d1.pdf?index=trueIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_162d73cfa3bc4f0f9926a1d26837bb7a.pdf?index=trueIn PDF document text
    • http://zubiluwetij.myartsonline.com/79076405362.pdfIn PDF document text
    • http://peledopa.myartsonline.com/1203227768.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/3909173015.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/41902700689.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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 5228 bytes
SHA-256: e8913f37ca69c866149a8762fc99c5253c30afc7fc45362eb61e9dc84e2552c7
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 10540 bytes
SHA-256: 8a93c0ed71c86d3cc5adb8042358b1a37c920616d96fb13d125c5df138db92e1

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