Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df305066b2fa3b2…

MALICIOUS

PDF

79.4 KB Created: 2021-06-14 01:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 743f4bf826cf5d11221c471293a67fb8 SHA-1: 4ba043e3b61f79d267a4aed6194ac81ebfdc2e19 SHA-256: 7df305066b2fa3b22c5d4e73674a14e91981fd7d73694f45f5482fb7e0dabab5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external URLs, suggesting an attempt to direct users to potentially malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/pbw?utm_term=clash+of+light+mod PDF link annotation
    • https://kanelepamub.weebly.com/uploads/1/3/4/1/134132184/2d16bd98810879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_604da66d398bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_604cd2813a5e6.pdfIn PDF document text
    • https://mudufisapegew.weebly.com/uploads/1/3/6/0/136097401/8488223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_601b2066bf093.pdfIn PDF document text
    • https://xesukalo.weebly.com/uploads/1/3/5/3/135311970/bogomuronupuma.pdfIn PDF document text
    • https://gapemudumowew.weebly.com/uploads/1/3/1/4/131437765/guguvafodowinono.pdfIn PDF document text
    • https://davanowaxisipu.weebly.com/uploads/1/3/5/3/135318110/lopuzuganif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475864/normal_5fd08a1650815.pdfIn PDF document text
    • https://luboguti.weebly.com/uploads/1/3/0/7/130739177/8b974a9f7.pdfIn PDF document text
    • https://tukixetijire.weebly.com/uploads/1/3/4/3/134314539/2489410.pdfIn PDF document text
    • https://mefomenixa.weebly.com/uploads/1/3/4/2/134235772/0a0a9c2b9d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/97fcb770-d6e5-4eef-96f1-a76ba119a350/noxaxek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd55992-c333-4afc-a3e7-59703feb3825/how_to_make_a_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b85ed5f-d2e8-465c-b3a6-cbc46865fcc7/how_to_make_white_acrylic_paint_at_home_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b40a3f3-6d39-4efa-b6bb-dc925dc6ce29/what_do_kachina_dolls_represent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595d797d-a22d-49e1-9778-42f9e9ad05be/35147802357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfdab90c-e856-49f6-a579-008dd386da9d/99810067598.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 4812 bytes
SHA-256: a123c7dda41fc5293b0f30f15bc44c157e2929ea707114483fd09bfa3ac04819
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 10568 bytes
SHA-256: 4ea0f96d02edb2be93766844189c1af0655a01b021b1737c77ab9025f2fcb951
font_03_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e