Malicious PDF — malware analysis report

Static analysis result for SHA-256 99913981934d8596…

MALICIOUS

PDF

76.4 KB Created: 2021-03-24 08:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0cc32ea1a7032003ad87d8e39408452a SHA-1: b1caa0f93d2cd6c51a0417eafd5f2bf0e0ccf9b7 SHA-256: 99913981934d8596edf34f1ad061c0f3bcae21ad5df123385e1643c9af8882c0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://golowaki.ru/award?keyword=birdy+skinny+love+piano+pdf PDF link annotation
    • https://cdn.sqhk.co/fikubife/7Ejj9ia/clueless_cher_costume_canada.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/10543802866.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/hi3ijij/86726651106.pdfIn PDF document text
    • http://lazadacostumercenter.com/how_to_recover_childhood_trauma_memoriesnnq8y.pdfIn PDF document text
    • http://tugrull.com/research_methods_for_the_behavioral_sciences_6th_edition_freeufchc.pdfIn PDF document text
    • https://cdn.sqhk.co/dagidomu/TGhc2hi/mosinovi.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/1o0mZ7T/sanitarium_metallica_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/7HeFhdH/suluk.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/MjbVhhF/cheap_piano_keyboards_near_me.pdfIn PDF document text
    • http://vavazexowupex.medianewsonline.com/java_programming_notes_for_beginners.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/97323616175.pdfIn PDF document text
    • http://erogancolumbia.site/viligasidulafumfeqj2.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/3UjVdpd/water_parks_open_in_california.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/kepaziboja.pdfIn PDF document text
    • http://italysummer.fun/stop_coddling_the_super_rich_summary7tpz7.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/jhgj6kC/79171352681.pdfIn PDF document text
    • https://cdn.sqhk.co/mumepefofise/id0ZMNp/vejozebudoretusalosamisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivozusemu.atwebpages.com/88628452748.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/goruso.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 5312 bytes
SHA-256: 30ebf9ead055d6d878f4ccce8c9949e1a540f2bfff30867515b7e94a9b363ab2
font_01_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 11556 bytes
SHA-256: 76ffc3c8cac672290b4324abf32b54cef9da078a6b7bd319eb35df7ca1d3c7d6

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