Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efdcd42012bfcee…

MALICIOUS

PDF

89.3 KB Created: 2021-04-13 02:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 27998eb6e4874744259c86eaaa18149f SHA-1: 525edfcf212acb8b784dccb51021a8ccce25e1e0 SHA-256: 7efdcd42012bfcee911b3d3ae0bd3f94cf226984c6d0ebcdaa116c66c6a864d2
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 0.9998

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://pelibifir.ru/strik?utm_term=hp+designjet+500+24-inch+wide+format+printer+plotter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455376/normal_60402c79c2773.pdfIn PDF document text
    • http://trells.space/what_is_separation_of_powers_australiamq5vq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_600cc6ad0a765.pdfIn PDF document text
    • http://akb54.ru/how_to_clean_mold_out_of_humidifierkfh95.pdfIn PDF document text
    • http://kefets.xyz/bufesojorumuxwgd.pdfIn PDF document text
    • http://kojanusipesipe.scienceontheweb.net/arunima_sinha_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_6057b1526ad83.pdfIn PDF document text
    • http://fidekeleko.medianewsonline.com/how_to_pray_for_a_good_future_husband.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/hobart_mixer_spare_parts_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53fce422-27cb-41e6-8aa1-cff6eeebee7f/megiforobejotemewifokuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd29ca9-6dd5-468e-b9c6-0a194688de2b/19162623094.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/no_quiero_actualizar_app_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac971c4-4816-43e5-b4dd-bfc80092dfc5/how_to_argue_with_a_cat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008c0872-2c23-4b5d-8ab9-f0021f58998d/resistance_band_workout_program_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/58570836095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed7c2e7-193b-475e-b6f6-71fbdb0486ab/viper_remote_start_error_manual_transmission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a6e7d7-224f-4042-a4f0-0a385bfe430f/sony_str-dn1040_protector_error.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_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 6216 bytes
SHA-256: 37b6c06c3f802c3119ad3e24d62b47796908310158c1d7c3709257889eb9166b
font_01_sfnt_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 11208 bytes
SHA-256: 4843f63c4c32cd7cf09e6683f8259046156e2346557c45ee7312eb9c96ad1886

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