Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ddea46eae552dc…

MALICIOUS

PDF

78.1 KB Created: 2021-02-24 08:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 01f1c6c9de477f21ab2859efba6fb895 SHA-1: 1a5fd5464250b2477062a1fe5f4f727a6a096d6c SHA-256: 25ddea46eae552dc313c2fdeb246aa95a6f3622aa986b13dbfe0f51061c046ec
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack, likely initiated via a spearphishing attachment.

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
  • 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://crophysi.ru/wb?keyword=how%20champions%20think%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_601314419ac03.pdfIn PDF document text
    • http://brosbass.com/dareludiwnamxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fff4f14e8627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382772/normal_5fe029c169ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_600b64c6708e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_602c1c8f0fb66.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/ibh4dia/quiz_boku_no_hero_rpg_aluna_transferida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5fee867f8b128.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/jcaChbZ/mufoveletozakubaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5fdc4580e1aaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489244/normal_600145b03ccdd.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://boribasumagit.epizy.com/god_almighty_movie_free.pdfIn PDF document text
    • http://boponewutizubi.rf.gd/eal_resources_free_worksheets.pdfIn PDF document text
    • http://wujikefixazoni.epizy.com/53525003424.pdfIn PDF document text
    • http://dokaginiw.epizy.com/37217106985.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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 5052 bytes
SHA-256: aa1dc7649ec4b4ed6545c62c068ed85cdf00b992bbbbe861a72b06aebb7970cd
font_01_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 11704 bytes
SHA-256: 8fa5732395746d7897e44f1ae07499e6f5a77ff556fad56bd1fe8a1e2bd39316
font_02_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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