Malicious PDF — malware analysis report

Static analysis result for SHA-256 1145ad261cf7c38e…

MALICIOUS

PDF

80.4 KB Created: 2021-03-16 11:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51ed9cc74fd3d9110c7fa1d6bc0fd908 SHA-1: 92aa61a4a66d069beec00fb82040b907eca88cb7 SHA-256: 1145ad261cf7c38edf5a36c215c174a146fa5997049c617edb8a34e413e99e86
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 0.9996

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://pelibifir.ru/wix?keyword=ancient+chinese+medicine+body+clock PDF link annotation
    • https://cdn.sqhk.co/zidodovare/ngdCGii/50104695183.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/20486998433.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/ij5PYhh/kawaii_pixel_art_kawaii_color_by_numbers.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/why_is_there_a_jumper_wire_on_my_thermostat.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/gdgh2hh/social_media_marketing_strategy_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/mghhb2l/jet_car_drag_racing_videos.pdfIn PDF document text
    • http://dorugatutaxovi.scienceontheweb.net/hallelujah_jeff_buckley_piano_sheet_music_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5fd2dccb2f2d2.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/norse_mythology_loki_father.pdfIn PDF document text
    • https://cdn.sqhk.co/jamolipa/ThjZ5ia/setilosovewenigowuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_602c43e73d9e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_603a421b62938.pdfIn PDF document text
    • http://nowtorrentz.com/givuv257wa.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/zavoputeropojirobiw.pdfIn PDF document text
    • http://vazagitomis.mypressonline.com/rufirafazepexovukemamam.pdfIn PDF document text
    • http://zubiki.top/60478012737cuj91.pdfIn PDF document text
    • http://frontglass.xyz/imperial_march_piano_sheettwqg7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://setovoj.onlinewebshop.net/candlestick_chart_pattern_analysis.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_5a269632968d4124ae39799acfce8d25.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_a5f25a1e27494062ab5d77392bd17f63.pdf?index=trueIn PDF document text
    • http://naranosufok.atwebpages.com/el_materialismo_historico.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/14240680063.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_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 5168 bytes
SHA-256: 1a319a190b859a791661cde13253cf7c52b8c4483ae21b7eb6ddfc582a7d5e3c
font_01_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 10792 bytes
SHA-256: b78c55ebf34d1985d2d719436821cfe42c85114e16eba3b7085c2666674d405e