Malicious PDF — malware analysis report

Static analysis result for SHA-256 765f79828c2da880…

MALICIOUS

PDF

99.6 KB Created: 2021-03-24 18:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0a864c9967017ce80f77caf9a3bd5e3c SHA-1: 28bd37efe437543cd7fc12c4a695b8a81ace8a76 SHA-256: 765f79828c2da8800ea24de507c935a7da9bd0133f45aa3056b805b661dfdd4c
126 Risk Score

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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+copy+chinese+text PDF link annotation
    • http://reduslimitaly.website/vezeworenonuzuzoe68ux.pdfIn PDF document text
    • http://esportzmlevent.com/623814310668ya1n.pdfIn PDF document text
    • http://test123test.xyz/how_do_you_program_a_new_remote_for_a_genie_garage_door_openerwee2a.pdfIn PDF document text
    • http://tamakar.xyz/94115850661p2nhc.pdfIn PDF document text
    • http://hallop.xyz/83496923527rf52m.pdfIn PDF document text
    • http://pelistens.xyz/telugu_ringtones_naa_songs303pz.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/5_month_milestones_listbna42.pdfIn PDF document text
    • http://sdfafq.info/nubetemevumuluduxoq0jn0.pdfIn PDF document text
    • http://afracheat7.xyz/7920636354f7als.pdfIn PDF document text
    • http://kushtanash.ru/basic_pharmacology_for_nurses_17th_editionh5wzz.pdfIn PDF document text
    • http://bezprovodov.guru/bosewopu6ar38.pdfIn PDF document text
    • http://lifeeuro.info/soundpeats_bluetooth_headphones_review8jwth.pdfIn PDF document text
    • http://abreudesigns.com/xukudexamijukotokifay36lb.pdfIn PDF document text
    • http://ihsteam.ru/lee_child_jack_reacher_books_in_date_order6rt07.pdfIn PDF document text
    • http://detonic-official.website/english_reading_practice_passagesl2ax0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://neguxonef.rf.gd/9884124332.pdfIn PDF document text
    • http://zulebolaj.rf.gd/60907586708.pdfIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_15908bcb148a40a5b55493e6946d682d.pdf?index=trueIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_eadfb755dae84dc792dc743ba7871912.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 17756 bytes
SHA-256: d46af2e85efbfeb82052d2c0d2f6a39b59799876b58bf03c2bbc1ec14eb46b27
font_01_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 4904 bytes
SHA-256: bb23868fe55f12b9992ca2ffcb95ce96cee85a48e337df826f9951e366fe1dca
font_02_sfnt_off00013349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 18824 bytes
SHA-256: 9ab2e75a387e1d3967c8a05d0125c3374078765f2e09fae7074c96cf8900df2e
font_03_sfnt_off00016a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A55 16092 bytes
SHA-256: 51675145e3b366ee8e7e67ead5b989b99de8271d59dc88fcb5751fd8b957a5c9

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