Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfa4bbbe63d7485…

MALICIOUS

PDF

93.0 KB Created: 2021-04-29 15:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 914a992b69511863b9e759607659cd51 SHA-1: b97570b7f7d17698f9ff42bc576cd11e43ff56e0 SHA-256: 7dfa4bbbe63d7485276664a944e2ad8af1ba46270ba32cea20bc55725042fb30
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to dafemum.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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+difference+between+the+ti-84+and+ti-84+plus In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_6047a5ed36507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469355/normal_6064e3e0d1249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fdf7b7cc110e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_6017229fd2401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_600a4c4ada79e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484612/normal_5fcad6f982326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479441/normal_60078fc6e2606.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/4ccad021-0d8a-4448-9adb-231c08b2982b/semalofij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34141eef-6328-4dc4-a1dc-dd1d37ccdf31/chapter_20_building_vocabulary_politics_of_the_roaring_twenties_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/94374175137.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_0ca09e648b864c679ae76ee35e98c682.pdf?index=trueIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_008a94187dbe46a68a2b141cf44537a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liluvad/4314401929.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_bf8d04d539694865a9dc2b0e274b18b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc20e2f-a206-4c11-9e73-ccff3d8386b3/60990464958.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/ontologa_significado.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/lisoriboxisixuxupivu.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_2e19ed11c7084203adfff15e94db03c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/mudisaxuka.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/the_song_film_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6644b9-a908-4453-8977-d88ba1ed37a0/tevuzuxapefobo.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 6416 bytes
SHA-256: 9e91590ae502ff902ba306624a00c8d44396a7ee9717b1bfa1717db63fe08483
font_01_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 5804 bytes
SHA-256: c17658619a98a16bcccaee7692f1dea75e13d24f93aeb62c33bc1c48c0b2c9eb
font_02_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 9360 bytes
SHA-256: 41be3306dc8a72ed47cf7efdcb0492975044c9ec7346821c3f23fc6918592a5d
font_03_sfnt_off00011f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 11252 bytes
SHA-256: c56fc6697c30c00fda5488b09d9a6cfcb793caf535337397905985e9ed481d52
font_04_sfnt_off000145b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B7 16256 bytes
SHA-256: 0c28d55d9957e5be45f9d3302843a1d8772fc4e8a9a81ea04eed1b5cc2016f23
font_05_sfnt_off00015b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B14 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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