Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc52da4ba7a58d50…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 11:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: afcde70ae5114117b57e37f74fa59c09 SHA-1: b0e9b76d45f0ad27c9fa520d35d6d5df3929175c SHA-256: cc52da4ba7a58d50bf6f6f960d8ca4e4d045bd4e1bd3eb8214b3f0323e70bf91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to host or redirect to malicious content. The presence of a "download button" heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/award?keyword=bio+pdf+download PDF link annotation
    • http://miguxinam.22web.org/algarve_tourist_map.pdfIn PDF document text
    • http://13millions-warzone.store/valusuvep9o73.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/8QNDig4/strawberry_cupcake_recipe_cream_cheese_frosting.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/jukisigixobujizi.pdfIn PDF document text
    • http://findattime.com/arduino_uno_software_downloaddx9f2.pdfIn PDF document text
    • http://callipakk2.site/484769128745w819.pdfIn PDF document text
    • http://copyright-services-us.com/vofuzc6hg0.pdfIn PDF document text
    • http://sitajejo.22web.org/gukujijen.pdfIn PDF document text
    • http://blockingscenery.com/can_you_make_a_flamethrower73w9h.pdfIn PDF document text
    • http://ilkertr.shop/63139561738nh8jf.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/ukWDgjd/98035097967.pdfIn PDF document text
    • http://pss77.ru/12764856247d2txq.pdfIn PDF document text
    • http://1gusevshop.space/captain_tsubasa_dream_team_apk_1._13xlbvx.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/40754254113.pdfIn PDF document text
    • http://allieshouseofhope.com/mumuxinulufirugobaleluwafpm4x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pudosuvosav.atwebpages.com/application_software_and_system_software.pdfIn PDF document text
    • http://rufazigivemebod.rf.gd/tinker_tailor_soldier_spy_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/adorno_minima_moralia_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/graphing_polar_equations_cheat_sheet.pdfIn PDF document text
    • http://tikikenuf.epizy.com/sapasorutumimibaxixaretug.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/manualidades_para_vender_en_tiendas.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_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 4904 bytes
SHA-256: 527434ba56e804b4cf05f651aa8a4e5df30177c24e86b39b8a410344ecf95ab8
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10920 bytes
SHA-256: 37326382d72e8cba4c672c9516f096998ac21d7a692dff5b795bcb2190ee3650

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