Malicious PDF — malware analysis report

Static analysis result for SHA-256 290bf686e8d55f91…

MALICIOUS

PDF

102.2 KB Created: 2021-04-16 07:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 428676189e1f1b0aec13789e6b457f23 SHA-1: 7efed4932c0a3fa53fa5ba13b32a2863a82db361 SHA-256: 290bf686e8d55f91b569c1845539d50c1b4ff24207cf3d26294a4dc38de71cb3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 detection. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/strik?utm_term=what+is+social+justice+in+public+health PDF link annotation
    • https://cdn.sqhk.co/regavebike/jmiiKKR/best_free_camera_app_android_2018.pdfIn PDF document text
    • https://biwozatilajatem.weebly.com/uploads/1/3/4/6/134636438/rebow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_606006a42485a.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/ikuznhb/happy_birthday_gif_jumping_dog.pdfIn PDF document text
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/7e08a71fc72d.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/oCzhjUK/mobile_digital_payment_stocks.pdfIn PDF document text
    • https://cdn.sqhk.co/zezaxemepe/hhwjbQC/ballade_vir_n_enkeling.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/jeWhahj/genoxesuzazukoduvubup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390323/normal_60461e81347f5.pdfIn PDF document text
    • https://takixesa.weebly.com/uploads/1/3/4/6/134621412/rawunibomituge-kanesapeza-migako-wizoretu.pdfIn PDF document text
    • https://nijuvabuf.weebly.com/uploads/1/3/5/3/135326727/gedamevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_6041d869a59d1.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/90721642b1906.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/3eddc5dc-e744-4bfd-9ffd-9096d2fbc456/pajonovazijixizoletuj.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_80ed478a00a94c879dcf508331d2cb00.pdf?index=trueIn PDF document text
    • http://tudutov.rf.gd/52881172377.pdfIn PDF document text
    • http://zabepir.rf.gd/motor_vehicle_act_amendment_bill_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978754cb-cf41-4dcc-9beb-891b11190ad0/why_is_my_electric_oven_not_heating_up.pdfIn PDF document text
    • http://nutajowaga.rf.gd/fowarabux.pdfIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_baf959c13dba45fd99c3c46456d3d460.pdf?index=trueIn 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_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 5156 bytes
SHA-256: eae5eaf0f4d2a21691c2072b0498c9ece6c7ac470a91f0b4d4a2d24fe29b160c
font_01_sfnt_off000134a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 6824 bytes
SHA-256: 09d70436d8085c7c0aed793345ea19fe0cbaf74bf74f57e5e71e3f75859a31b1
font_02_sfnt_off00014c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C01 11808 bytes
SHA-256: f4266a7653d265e035fcd5a75693da8193348f5125415d6fd9955a74aa825b39
font_03_sfnt_off0001743d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1743D 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb