Malicious PDF — malware analysis report

Static analysis result for SHA-256 c231482d2abe523d…

MALICIOUS

PDF

82.4 KB Created: 2021-03-28 18:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 484ea7de67420f8c97fc71006c4445f7 SHA-1: 6a08c7f8be55fa40e78be0763e80928e52c50430 SHA-256: c231482d2abe523dd4f54887b53fba2282da6313d2ba3626f99542fbbb97f23e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://pelibifir.ru/strik?utm_term=why+did+my+fan+turn+off+by+itself PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366305/normal_603852038c9c5.pdfIn PDF document text
    • http://mixed-rootwork.com/faxerujuxibakuxopififuawc.pdfIn PDF document text
    • http://trikotoria.ru/what_does_stet_mean_in_proofreadingbf6dp.pdfIn PDF document text
    • http://fdvsefwfrw.space/51554775825503up.pdfIn PDF document text
    • http://larediwavokib.iblogger.org/wine_labels_template_free.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/xudadizagivojaxoporulawi.pdfIn PDF document text
    • http://madokedaxemosu.22web.org/jolugixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_603b114272ebf.pdfIn PDF document text
    • http://nogefoxezegu.22web.org/advertisement_examples_for_students.pdfIn PDF document text
    • http://povar2020.site/bathukamma_naa_songs_2017bjh2q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374954/normal_6006a4d604d54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxobuduxude.epizy.com/formation_automatisme_industriel_casablanca.pdfIn PDF document text
    • http://vofimefokugof.epizy.com/45969126338.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_f033e73ba92b4751a4313537430a97b7.pdf?index=trueIn PDF document text
    • http://wadumoseri.rf.gd/45694168057.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/sanitary_napkin_incinerator.pdfIn PDF document text
    • http://voveganodamamuf.rf.gd/how_to_remove_ruler_in_mac.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_7d631e4287ed4285a3cd0ecae158b770.pdf?index=trueIn PDF document text
    • http://pufigopinenise.epizy.com/5_love_languages_summary_quiz.pdfIn PDF document text
    • http://didabatok.epizy.com/third_conditional_exercises_autoenglish.pdfIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/96068523323.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_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 5404 bytes
SHA-256: 251f08c7210cba3bcd7c6e541cf5c1fa00f8bf7989feb88eb33de65dc914b5d9
font_01_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 10612 bytes
SHA-256: 38014eab74fdd542b6187b653c41df22f7673967d1bb29d4944ade2bc7ed1be5

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