Malicious PDF — malware analysis report

Static analysis result for SHA-256 9337823297541abc…

MALICIOUS

PDF

72.3 KB Created: 2021-02-14 01:30:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e4ac3a2f10535ea25045421fe74f5c39 SHA-1: 5c53670d2b329c85a01c0e8abb485f98fc54da71 SHA-256: 9337823297541abce09de86cbcf08d2744523fded661b4d4a3712e998597254c
184 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to academic materials, likely to trick users into clicking malicious links for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=8.4.2+arcs+and+sectors+worksheet+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5feb1ccde843b.pdfIn PDF document text
    • http://magic-world.site/vavapinatiroradiftq64q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_601135006bd7d.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/6hcNjji/64340386564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486197/normal_5fd92053ef9a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viminug.epizy.com/fountas_and_pinnell_guided_reading_lesson_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/fudukubojasasuwuju.pdfIn PDF document text
    • http://nigowona.rf.gd/bizukulizijixe.pdfIn PDF document text
    • http://zudovufakigib.epizy.com/currant_creek_fly_fishing_report.pdfIn PDF document text
    • http://bomatep.rf.gd/dilololozasuvajupokut.pdfIn PDF document text
    • http://bojefej.epizy.com/earthing_sheet_uk.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_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 5500 bytes
SHA-256: 10e0544f373b5a5f7c9d9f6411864ac176e3545084eac04c1206d32c85e63360
font_01_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 11188 bytes
SHA-256: f7147e927c5ae1d3a43aee4d4bdf61ffdde16fbd9748400a3f8e057126db7f9b

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