Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8333d86e148ea2…

MALICIOUS

PDF

102.5 KB Created: 2021-03-10 00:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bcdc160c52d3fdcda8e473e1e52398fc SHA-1: 047bfdaed4931eb433f98b6cebd5f604c60e8cdf SHA-256: 2f8333d86e148ea206f98c5b2dd5a068368ed18f6fdf4b678924f9387c90dae7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('vilenefex.ru' and 'tiwimifozukimu.medianewsonline.com') that appear to be part of a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of these URLs strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=greek+mathematical+symbols+pdf PDF link annotation
    • http://tiwimifozukimu.medianewsonline.com/flight_of_ideas_vs_knights_move.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/win_10_to_usb_drive8m4eq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5fcbe6f4287df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_6042186947b74.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/data_science_masters_worth_it.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/rafivijafirim.pdfIn PDF document text
    • http://heymama.store/wasokiwusukeo1.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/how_to_do_construction_cost_estimate.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/zadevapujagi.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/bobcat_s650_code_m6803.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/74968ef6-6fc6-4b62-b121-ef6bf35181e1/ejemplos_ecuaciones_de_primer_grado.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/smarther_bticino_manuale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6e0910-5b16-4bdb-a03a-00fba40a94bb/badamune.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/2009_bmw_x3_manual_transmission_for_sale.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/87541997312.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/how_to_calculate_volume_in_liters_from_inches.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 5732 bytes
SHA-256: 200171cb093ad3f64d9e5d36904055fbfd130ca8c779fd626ce2fb5d8bd59d80
font_01_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 22504 bytes
SHA-256: 728ac8b1179c53f8e1637972190394e8044476bb7bfcd00e5a6331d7ad6afec0
font_02_sfnt_off00017610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17610 16544 bytes
SHA-256: cf0abe685e7a181e9f287a89bf0a9aaf8fa7d7b442adce4fd2df528a1692dc1a

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