Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba86092b15e6aba…

MALICIOUS

PDF

82.8 KB Created: 2021-03-30 07:39:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 236849beb45b4e4669d08635dd5765c4 SHA-1: 91b589babee821325096b2603e86ee530f04658f SHA-256: 3ba86092b15e6aba39e389910f61fb8552f6fda0a09e8741fe24392078adf899
126 Risk Score

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 maliciousness. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('druttle.ru') that is likely part of a link farm designed to redirect users. The presence of external URIs and the overall structure suggest this document is intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/123?utm_term=christian+marriage+songs+free++telugu PDF link annotation
    • https://cdn.sqhk.co/dewufidabo/eDREDIs/my_eir_top_up_online.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/kubotoxikiw_xawavapexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_603b4e4d4ad02.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/fgeUMyf/generic_adderall_30_mg_tablet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482636/normal_6001da347e444.pdfIn PDF document text
    • https://rowafitiw.weebly.com/uploads/1/3/4/6/134608100/kogisezorogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503050/normal_604941d46ac24.pdfIn PDF document text
    • https://gemuvubakada.weebly.com/uploads/1/3/4/4/134494784/bufopifijixogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370778/normal_5fed5df13638b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492586/normal_5fc8d63e51586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fe41a6869fb8.pdfIn PDF document text
    • https://pesefusuf.weebly.com/uploads/1/3/4/4/134486856/pujesowipisufix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5ff3752ccfa68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_60480d30858a9.pdfIn PDF document text
    • https://mobuverafawez.weebly.com/uploads/1/3/5/3/135346795/dumizatulubawubidam.pdfIn PDF document text
    • https://puvebimu.weebly.com/uploads/1/3/4/3/134311544/runuvovun.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/kenib.pdfIn PDF document text
    • https://cdn.sqhk.co/rapedipular/id93ibu/40714240489.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/36426b65-4bf5-471a-919f-f9a1828639d5/craftsman_gt5000_mower_deck_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9076c973-ab04-4eb7-bf91-6280ba97a76b/deadlands_reloaded_players_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3d8b91-bf32-44e8-9406-9b08a7188894/why_is_my_printer_printing_blank_pages_hp_deskjet_2600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f42d03-e495-4988-9dce-739bb6f5e019/vafijusaxovizuvoziropape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c38fe05-1e3a-47fb-8fbe-13c9689fca4f/p90x_workout_sheets_app.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_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 5084 bytes
SHA-256: 6079c2d3848607658e8e7a820ba9428723df22a268e68b37f28972168fe3c27a
font_01_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 11444 bytes
SHA-256: 53b0c120548b4df5b3167a329ded0b7a3db16fbf7b3f3985c190f2d734ed4b12