Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8918e5a874dc3ae…

MALICIOUS

PDF

90.7 KB Created: 2021-04-01 13:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2055f1e9762dea6cffc7e4c24cb7f03 SHA-1: aa8d2b52a1bd3c880a4af1d4bd87bb6c08dbeed2 SHA-256: f8918e5a874dc3ae31f029830f4d9e8e9fd127f1348ed6f2f8fac7fd3806b197
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9992

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/award?keyword=descargar+cancionero+cristiano+pdf+gratis PDF link annotation
    • http://bovewitavivebu.getenjoyment.net/romeo_and_juliet_notes_for_students.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/FfIjcih/rootless_pixel_launcher_pro_apk.pdfIn PDF document text
    • https://diwirutug.weebly.com/uploads/1/3/4/3/134387727/197147d1b.pdfIn PDF document text
    • http://my-favshop.online/medical_microbiology_textbook_free5709f.pdfIn PDF document text
    • http://songkfrk.site/how_to_use_krups_coffee_grinder_f20328tm2.pdfIn PDF document text
    • https://ranefegol.weebly.com/uploads/1/3/4/4/134498511/2651463.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/what_did_the_brown_vs_board_of_education_court_case_ruled_unconstitutional_in_1954.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/gJshhzJ/1773983800.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/d8bac.pdfIn PDF document text
    • https://litudawugo.weebly.com/uploads/1/3/3/9/133997631/badagutawuf-zotup.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/innovative_business_ideas_in_pakistan.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/6062293.pdfIn PDF document text
    • http://rubisteq.online/96705482250qdmsk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_f4582b4365794292ba588edf533d9761.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fixararololu/sketchup_3d_warehouse_2016.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_0c5edafb5393427891b0f2da7108fe84.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_d17960605e844adab1adca7453341274.pdf?index=trueIn PDF document text
    • http://lumosaneja.onlinewebshop.net/antibiotic_resistance_genes.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/luvasovuw.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/what_is_scatter_diagram_explain_with_example.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/how_to_clean_bosch_washing_machine_drain.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/strawberry_green_tea_starbucks_nutrition_information.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 5292 bytes
SHA-256: 503f47aa99a1583d4f5b1a6fd6c5eb7f964774701e8caeeba2440f1d06134795
font_01_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 5268 bytes
SHA-256: 21d1ac1375f8fe125d3587041e303ae46034980699dc478320cd13ee76ba3e00
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 11948 bytes
SHA-256: ac13ad243ed8dc82ea5d910d9489b0d5357b29f18da8a885f8ba3852873deda9
font_03_sfnt_off00014732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14732 16208 bytes
SHA-256: 9dcfacd51a92ecef57927e08443fc4e2d0a59cb10048978cd11cfd22bed3867b