Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a782bf3a07fd249…

MALICIOUS

PDF

76.3 KB Created: 2021-02-27 10:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3c7f5b415f2f2d45d31ab53c81edc1d8 SHA-1: c64b2900a3b034da01cdf2f876dfec3225092c92 SHA-256: 4a782bf3a07fd24983f5c6bdf8a987548e10c98827b99c8ccedf6ee747c6ab07
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable or suspicious domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious redirection attack.

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://gimoguvi.ru/123?utm_term=the+good+girl+book+mary+kubica+movie PDF link annotation
    • http://kopogaxepaku.sportsontheweb.net/tp-link_tl-wr841nd_v11.pdfIn PDF document text
    • http://giocodigital.space/rime_of_the_ancient_mariner_quotesloo9m.pdfIn PDF document text
    • http://yandex-dostav.ru/1181975196399ssb.pdfIn PDF document text
    • http://natur-green.fun/spur_gear_design_procedure2h4no.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/house_on_the_hill_lyrics_lil_skies.pdfIn PDF document text
    • http://mylic.ru/44048748521ev4cg.pdfIn PDF document text
    • http://fupodiruza.66ghz.com/seoul_metro_map.pdfIn PDF document text
    • http://youla-24.cc/bolos_formatos_variados14tbn.pdfIn PDF document text
    • http://alfa-quest.ru/formules_magiques_alphasq1bdx.pdfIn PDF document text
    • http://wersita.fun/zikutaxabopesovni69.pdfIn PDF document text
    • http://lnstagram-office.com/brukner_khan_s_clinical_sports_medicine_injuries_vol._1r1zcc.pdfIn PDF document text
    • http://obschee.xyz/free_iq_tests_with_answers_and_explanationstmiar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miduzusajaveg.rf.gd/kodaline_moving_on_piano_sheet_music.pdfIn PDF document text
    • http://xovolefewawex.atwebpages.com/wodefimebowojurexidamo.pdfIn PDF document text
    • http://xinasewaja.epizy.com/rekijugilaxiripifugivem.pdfIn PDF document text
    • http://xavisijividefo.epizy.com/dinomot.pdfIn PDF document text
    • http://nujafosedoke.epizy.com/asphalt_6_adrenaline_2d_apk.pdfIn PDF document text
    • http://sejabozewilobog.epizy.com/fox_sports_ohio_cavs_reporter.pdfIn PDF document text
    • http://rapuxatidugek.epizy.com/xavigixavajeruzep.pdfIn PDF document text
    • http://lonivone.rf.gd/71257672937.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_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5492 bytes
SHA-256: 1f8fe8f3c7dbced006799a292fa870932a3fc9af76b2aaeee8e80ce405b6091a
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 10588 bytes
SHA-256: 77f0a43a2ec7be089aaa353cba0de873bc0fbc77c5a862cf38d1a46886c9c175

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