Malicious PDF — malware analysis report

Static analysis result for SHA-256 381373f5245e3e26…

MALICIOUS

PDF

79.9 KB Created: 2021-03-15 16:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b1a74d20e6d59c53b59928efecfdd6f8 SHA-1: 18d3f778065cae15044579c90e12863300de4543 SHA-256: 381373f5245e3e26fbf90e891c60e0fa5bdce32fcb1e754e7c965809e5e829b9
156 Risk Score

Malware Insights

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

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 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=yu+gi+oh+apk+duel+generation PDF link annotation
    • https://cdn.sqhk.co/gixezovof/gj55icx/kawaiistacie_slice_of_life_2020.pdfIn PDF document text
    • http://telgrm.site/jejosadad36uug.pdfIn PDF document text
    • http://nakozek.mypressonline.com/listado_de_medicamentos_y_para_que_sirven.pdfIn PDF document text
    • http://vkysnaya-eda.site/ribedizopemilavgxszc.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/hHgfjd2/porelawibabobopu.pdfIn PDF document text
    • http://kyhni.site/quartz_job_scheduling_framework_download07j9e.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/TidrvrR/xajovudulilikaxazupojimov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixubukumow.rf.gd/54538020274.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_928a2a9736f8482cb2b8382b5c8ac456.pdf?index=trueIn PDF document text
    • http://terefikug.epizy.com/school_bookkeeper_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/4277603652.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/25545031538.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/42292970792.pdfIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_d10d72558b324352885bc3a95adf0aff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosevud/does_whirlpool_still_make_duet_washer.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_7e9bd87492994b27a06094f076847df9.pdf?index=trueIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_d9c2aa25f0f54b34a799844e1f9790c0.pdf?index=trueIn PDF document text
    • http://javamav.rf.gd/43660644280.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/a_rocket_to_the_moon_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/26371967620.pdfIn PDF document text
    • http://fezifax.rf.gd/hold_on_chord_overstreet_lyrics.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_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 5068 bytes
SHA-256: 74f70cf702f822cf9ce6c4877f047baa10444d2adba84333a285fc103ed9f81f
font_02_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 11044 bytes
SHA-256: 70228dde6e7f3c7379f241a1f706ae255f266f879b187f1d1639505b50ef9850

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