Malicious PDF — malware analysis report

Static analysis result for SHA-256 b623d1b1e101f433…

MALICIOUS

PDF

83.0 KB Created: 2021-03-06 05:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0553ef408991879af7923eb0f22ac681 SHA-1: e37518ab28b718841b46c0d7c5419de9a93423b0 SHA-256: b623d1b1e101f4330cc6d72cbb5a1800fea40e5ec53dd5c1365fa20dd5cb82dd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and instructs the user to enable macros or editing, which is a common lure for malware droppers. The presence of these elements suggests the file is intended to trick the user into executing a malicious payload.

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://dugedepap.ru/123?utm_term=visual+basic+2013+tutorial+for+beginners+with+examples+pdf PDF link annotation
    • https://vubopedu.weebly.com/uploads/1/3/6/0/136083963/vosetajixetuwerot.pdfIn PDF document text
    • http://filebitikuj.iblogger.org/jizukefofavegijuzivenulup.pdfIn PDF document text
    • http://budoxobiv.22web.org/cs_lewis_mere_christianity_chapter_1.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/eYVy8fN/78220605258.pdfIn PDF document text
    • https://cdn.sqhk.co/woferomot/ije7hhm/netgear_smart_home_base_station.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/8566907.pdfIn PDF document text
    • http://xadikefivo.iblogger.org/what_does_the_bible_says_about_divorce.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/iehgNCP/35940865694.pdfIn PDF document text
    • http://xadebiwivupogof.iblogger.org/qu_es_el_problema_de_investigacin_cientfica.pdfIn PDF document text
    • https://fogolimavoburaj.weebly.com/uploads/1/3/0/8/130813413/9a091c35e0c43de.pdfIn PDF document text
    • http://noluwokufemifoz.22web.org/what_is_a_business_records_affidavit.pdfIn PDF document text
    • https://lirisosu.weebly.com/uploads/1/3/1/3/131384099/wujedu-lamaferi-nibav-miwitosixexilix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zosajirigo.rf.gd/nekokos.pdfIn PDF document text
    • http://sewasijibakel.epizy.com/8763422051.pdfIn PDF document text
    • http://tifilumiteva.epizy.com/catalogo_avon_campaa_18_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0647e202-19c6-401a-ae26-2e282bd19aa1/marlin_model_60_sb_rifle_with_scope.pdfIn PDF document text
    • http://surubaf.epizy.com/format_to_decimal_places_c.pdfIn PDF document text
    • http://motojanafit.epizy.com/what_is_the_shining_hotel_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418f1602-b34f-4dd1-8cc9-67d07a156074/landmarks_in_humanities_4th_edition_free.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/niwowitutufog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4206d3af-4cb4-4450-a3b4-282328ab7960/how_do_you_know_if_you_have_a_bacterial_or_viral_chest_infection.pdfIn PDF document text
    • http://riditiv.epizy.com/the_road_not_taken_plot_summary.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_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 6324 bytes
SHA-256: 3f37eab307466f5174693c9d821cbf3952149846ab59e748ac3cd30c255bd99e
font_01_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 11704 bytes
SHA-256: 8ea7b10b973077749686396e1161ce6d8f041e6dbe8d1bc3e27c9299c4e9b646

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