Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df519d0a8811e04…

MALICIOUS

PDF

81.5 KB Created: 2021-04-27 16:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9137b3c77c4d2f80de6b1a1f467ece27 SHA-1: 113ee88b5a43ee7c3093cca0bd3199a822bbc543 SHA-256: 0df519d0a8811e04555c377a0a3e233f078788d07d10d220cb731ebc6380701d
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to vehicle maintenance. The presence of numerous embedded links, many pointing to external PDF files, suggests a link farm or SEO poisoning tactic to distribute malicious content. ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+is+the+maintenance+schedule+for+a+honda+crv In PDF document text
    • http://sijemogezabusa.sportsontheweb.net/writing_about_writing_a_college_reader_third_edition.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://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_178001accd5145faa35924a6fd95648c.pdf?index=trueIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_3c39dc5710a34d0a830b455d509438f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/wurabagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8922e36-3d24-4a79-9b09-7845a37cbd69/sub_zero_fridge_freezer_cost_uk.pdfIn PDF document text
    • http://daraxojizusavu.epizy.com/96760257134.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_0cf4686291c94eababca15f411ec6cba.pdf?index=trueIn PDF document text
    • http://zedoliwitimevaf.epizy.com/85745056973.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/focusrite_scarlett_2i2_software_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/82857757323.pdfIn PDF document text
    • http://napamewa.atwebpages.com/66509284712.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_800241e89d594c1792ef3b063123c1ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd5a973c-2a95-4429-bff2-efe22825332a/zizerelibusolesajido.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/46733165895.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/ophthalmology_reference_books_free.pdfIn PDF document text
    • http://bozumux.epizy.com/nespresso_lattissima_touch_user_guide.pdfIn PDF document text
    • http://gibovutapobubu.rf.gd/guzonoguzuwufokumot.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/inheritance_in_java_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/engenius_eap600_hard_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/gatekexemijupi.pdfIn PDF document text
    • http://lifosodutevofa.epizy.com/what_is_a_sketchup_classic_license.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5216 bytes
SHA-256: f76918e1d8ffc79e936ab9b9576ed8cfb5298bf87e5cc1aafb7c361e24492f29
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10808 bytes
SHA-256: ebc26a7c486ceaba3dfd7ecfe5f7aa01fcb64b57fc498fe93dc27a9b46c7a208
font_02_sfnt_off00012a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A89 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361