Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa5cec7d64fc458…

MALICIOUS

PDF

83.8 KB Created: 2021-03-11 01:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 6db308a78681eb8254ed5f38c095343d SHA-1: 8175d74a2b20eaa8a206d2c5b315bf9fbe9afb3a SHA-256: 3fa5cec7d64fc458e35a730f73998de234d7d1eb595e8f753db242e0abe2c8b5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=pregnancy+induced+hypertension+pdf PDF link annotation
    • http://lnstagram-help-businesss.com/diablo_2_players_commandz9np8.pdfIn PDF document text
    • http://drovazvenigorod.ru/ambarsariya_mundeya_video_song6rn81.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/aAyUEvc/54746189635.pdfIn PDF document text
    • http://eurofamily.pro/towixekifusawefotuvmc2ej.pdfIn PDF document text
    • http://dk-inc.xyz/the_blind_side_movie_clipskv8p2.pdfIn PDF document text
    • http://kotonopiz.iblogger.org/disciform_keratitis_zoster.pdfIn PDF document text
    • http://domensita.fun/parallel_structure_worksheet_chomp_chomp7oj2u.pdfIn PDF document text
    • http://poverkavoda.website/wosazovotanujasavixededzemaq.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/gejg3ge/espnfootytips_number_in_brackets.pdfIn PDF document text
    • http://erogan24.website/bikiniroymgj2.pdfIn PDF document text
    • http://lofitner.buzz/example_of_reliable_and_unreliable_sources_of_health_information_and_products0mzw4.pdfIn PDF document text
    • http://faceit.su/plum_berry_cornmeal_sheet_cake1fvjo.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/iihehfn/58125030849.pdfIn PDF document text
    • http://legendarycraft.ru/49756450940x140.pdfIn PDF document text
    • https://cdn.sqhk.co/lekuruzomef/jgc1Ucp/21396553264.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://fawosafo.epizy.com/47568016534.pdfIn PDF document text
    • http://koraxirimaxodet.epizy.com/44072449441.pdfIn PDF document text
    • http://luxepiluwi.epizy.com/73531800992.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_c1520f50ec974fb385d87c736e6a67b5.pdf?index=trueIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_9cabee60329242599196553774fa552d.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_4ea5588a0ccc43199915c3cec0893456.pdf?index=trueIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_bfd1fbd289a74de0aa684764c637fb8d.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_455992f8ff50452a97a4a14fce503400.pdf?index=trueIn 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_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 5368 bytes
SHA-256: 8a97c4f2ab49f7154356a271b0de3ed82ac3a0501172d4a3202069773f02152f
font_01_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 10304 bytes
SHA-256: b4685e872aee56951b1f8da0e85e4645f7f1306ad041b602f1df76b4027abb89
font_02_sfnt_off000132dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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