Malicious PDF — malware analysis report

Static analysis result for SHA-256 285b417fa63c3991…

MALICIOUS

PDF

75.0 KB Created: 2021-04-04 12:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d5766ffb8e330c87171ff06436e61a3 SHA-1: ffa699ffb9e5e79fd90c17cc65b397eb43cab36e SHA-256: 285b417fa63c3991801220a2979e237344a1e4f023a5297fae67b634ace83e75
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. 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 0.9997

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://xajibur.ru/123?utm_term=cinquenta+tons+de+liberdade+pdf+google+drive PDF link annotation
    • http://fapedivojo.22web.org/90364883396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387417/normal_5ffbe184a073c.pdfIn PDF document text
    • http://ses-paypal.com/how_do_essential_oils_reduce_stressfpffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_6025f0741f843.pdfIn PDF document text
    • http://onlyforyou.space/488261465387i94a.pdfIn PDF document text
    • http://gazuravalo.iblogger.org/korugilugobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454162/normal_602e81d412780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_6017400032fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_5fd95b558c2d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459625/normal_5fe04df08d51d.pdfIn PDF document text
    • http://vivadoctor.ru/retention_bond_templatean20e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fe449d3b9f9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rujemivegelap.epizy.com/auto_transformer_starting_method.pdfIn PDF document text
    • http://vazavaxajude.rf.gd/clases_de_acordeon_de_botones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a879bf2-525c-4668-be1d-d0e8a62d74c4/how_to_get_baby_groot_back_bling_fortnite.pdfIn PDF document text
    • http://sudezubedafa.epizy.com/rf_power_amplifiers_for_mobile_communications.pdfIn PDF document text
    • http://pikowejinaruwut.rf.gd/agency_agreement_nsw_form.pdfIn PDF document text
    • http://masoxagami.epizy.com/how_to_fix_a_pocket_juice_charger.pdfIn PDF document text
    • http://zatojigetafugud.epizy.com/8029179790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40bdd5e7-d4bb-475e-b192-ae9f75c18035/dumogimorotubugutujebumon.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_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 5440 bytes
SHA-256: 1332410df9622313698990baf34b01ed848add1f0785370e7084d64fd834b0e4
font_01_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 12324 bytes
SHA-256: ca317594076d90716668acd938d2cf619ef570744e04bba2a1746fe08df4c941
font_02_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378