Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bc1569d4771b32…

MALICIOUS

PDF

81.3 KB Created: 2021-02-27 02:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 121252c7c9f25ed15ae5c2218c5eb76a SHA-1: 4744740055784c8fb407644d95c5659f3af3af38 SHA-256: c3bc1569d4771b3254b5a67dc476b540fff37f12ac19c2839aa4def31d3053c5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of multiple links suggests a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=arrl+dx+cw+contest+2020 In PDF document text
    • https://cdn.sqhk.co/xetokive/fhfhbia/metal_slug_3d_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/zivupowixede/1jjmgf7/26307297726.pdfIn PDF document text
    • http://zoluvukabufe.iblogger.org/angular_6_formdata_append_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/hO6xjbi/janixuxumipizidotoreg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fd0925c17d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_6037d9cfa911a.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/guzewosafomut.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://rikonuge.rf.gd/101_weapons_of_spiritual_warfare_free_download.pdfIn PDF document text
    • http://wonaviga.rf.gd/8786158606.pdfIn PDF document text
    • http://laganomezavarof.epizy.com/crosswords_with_friends_answers_10_23_19.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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 4888 bytes
SHA-256: 4ba162bd0f7e2dfab616b3e798255258f9440189971a8199ecb9836de63ac463
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 11088 bytes
SHA-256: ca7cc5bfd28852ec83b5b4c4b8d36ed3385cd89e990512319c8f37f4ba74cb24
font_02_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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