Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cd67cdd3160fd9…

MALICIOUS

PDF

79.0 KB Created: 2021-04-01 16:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6a64b84046deb872015813284a1cc0e3 SHA-1: 50ecf447101cdb426e85d5d3538bf5e8a49c8d1c SHA-256: 77cd67cdd3160fd9526d7318ca6335b4699dccafbafcbc2e43e551d167cf12cb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 6

  • 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.
  • 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://resalured.ru/award?keyword=fu%25C3%259Fball+wm+2020+achtelfinale+spielplan+pdf PDF link annotation
    • https://cdn.sqhk.co/figoveraboj/jzwGxgi/pabapozamupetofetaw.pdfIn PDF document text
    • http://napabedavidok.iblogger.org/list_of_strong_and_weak_bases.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/hjexQSc/tiktok_mashup_songs_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/jhgdEjg/zombieland_2_cast.pdfIn PDF document text
    • http://qunit.space/2498737175076gih.pdfIn PDF document text
    • https://toxodapakaxoza.weebly.com/uploads/1/3/4/5/134525452/pepalewaxopawu.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/MxjhihU/nagigebu.pdfIn PDF document text
    • http://damita.fun/what_is_a_good_computer_for_a_senior_citizene0t0m.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/fichjH2/sheetrock_lift_extension.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/chdvg5o/nfl_week_12_schedule_changes.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/ia5jaie/lanigesasokono.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/FWHthfc/lutedamalubugomekarataj.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/fJJ2hfV/joy_music_free_music_apk.pdfIn PDF document text
    • https://nokatumevizo.weebly.com/uploads/1/3/2/7/132740479/2b24e0e964b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixasosuj.epizy.com/potilobiwoxorili.pdfIn PDF document text
    • http://tizesezovix.epizy.com/90072922981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ba9fc8-189a-491f-921f-1d7d32a8a54a/the_boarded_window_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8032e18b-c39c-4c73-b260-be1dde014d3f/bird_with_yellow_beak_and_yellow_feet.pdfIn PDF document text
    • http://jojukam.epizy.com/what_are_the_tre_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c57be2b-c258-4f5b-8a68-022c429ec4f3/gaggia_titanium_fill_water_tank_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b331e057-030d-466c-b6cf-35be910d05d7/feseniwavipakatud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf07ad7-8d79-4204-9b47-c0cedc91f87d/kejiwakuwafefenujiten.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_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 5964 bytes
SHA-256: 1884e788430d4503d4904baa06cba53c544557f3dfec2fb83c13bb1b1c5e02c7
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 11596 bytes
SHA-256: d90947392b5423107f7397680e0590b0673ba5873026585f52d9c100a64b56ce

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