Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f50f3fa4372c4a3…

MALICIOUS

PDF

77.5 KB Created: 2021-03-15 08:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7ea16c77070d3d7ea108978d97b76e89 SHA-1: 5b394e1d8ff3024c9984866cad9caa61e3b5612f SHA-256: 1f50f3fa4372c4a3bcde0c0acac92833506939c5280e7dcab02cbf679c393a29
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

Heuristics 5

  • 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.
  • 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://nipisod.ru/123?utm_term=form+koleji+bornova+telefon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421462/normal_600fb1dd3c565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fccd3d55ac16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_604508d2db486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_603a14e1dc7f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_6009fef347ae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotowolufifogal.epizy.com/alkalinitas_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbd7d80-a747-49cb-b5dc-8583eb1ec85e/51331710973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c990e0-a52f-45d5-8e35-31d05d0872a9/garmin_920xt_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/historia_del_bienestar_social.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/mugimiligedimedenafet.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/nejagigulut.pdfIn PDF document text
    • http://kevulapoxokimif.rf.gd/is_polaroid_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef73c550-8133-4035-8526-0e8b848b66e4/how_to_use_cricut_provo_craft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9a7b81-803c-43d9-a45c-7ec968e6611a/how_to_add_font_on_wix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f93ff90-12ae-4071-80bd-a7fb0b86775d/46520053948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c085b4-b29b-4b31-b8bc-6cf0bbc806a9/perloff_microeconomics_theory_and_applications_with_calculus_5th_edition.pdfIn PDF document text
    • http://robebiwasufilu.epizy.com/varaje.pdfIn PDF document text
    • http://dudanijop.rf.gd/anti_anemia_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/hbse_class_12_compartment_date_sheet_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075c6aed-ebf3-4c2f-8487-3e90224f7235/why_we_sing_by_kirk_franklin_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf18846-9262-47b3-bc8c-764325b4a967/jufipidufofaluganukegug.pdfIn PDF document text
    • http://zaxiwuxenur.rf.gd/nunonuzekumijefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b109528-d2e1-4be3-8e67-883e80999cc3/2007_honda_odyssey_transmission_rebuild_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96065bb1-51df-459c-8843-3bddc604ed09/suxejo.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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 5028 bytes
SHA-256: b37dd4d384de55d28346c3755634d62f29b1c709c032b119b49ce0534be83af5
font_01_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 12700 bytes
SHA-256: 6a9eb4d5bc7f8c5246d1a77791e8dcbbeaf66d8983c9e801188f1d388c3581ad

Open this report in the interactive analyzer, or submit your own file for analysis.