Malicious PDF — malware analysis report

Static analysis result for SHA-256 1884bd380223da8d…

MALICIOUS

PDF

83.8 KB Created: 2021-04-15 16:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edfdcec0abf0fc5eebaf8a2358a7fa06 SHA-1: 63f453e2ea78ce9ce131700c3c1551864753dda2 SHA-256: 1884bd380223da8d34d71e21ce6629474c4b24895c7e27223458cc3d021bde0e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary malicious URL identified is dafemum.ru, which is likely used for phishing or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=ranger+medic+handbook+2020+pdf
    • https://cdn-cms.f-static.net/uploads/4470526/normal_601a0f8a8533d.pdf
    • https://cdn-cms.f-static.net/uploads/4471690/normal_60541850a0268.pdf
    • http://smartroom.pro/ascp_boc_study_guide_6th_editiong2sb8.pdf
    • https://cdn-cms.f-static.net/uploads/4471996/normal_60249f72dda54.pdf
    • http://normaa-id.com/software_development_engineer_amazon_salary_bangalore532bq.pdf
    • https://cdn-cms.f-static.net/uploads/4476007/normal_601b65d932bff.pdf
    • https://cdn-cms.f-static.net/uploads/4486346/normal_6036625bd6e43.pdf
    • https://static.s123-cdn-static.com/uploads/4366952/normal_5ff1f1176a7ac.pdf
    • https://static.s123-cdn-static.com/uploads/4392871/normal_5fee38dfee978.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f2a7f74e-8106-4a9b-81d8-b4ccdeeb05ae/12515756548.pdf
    • https://s3.amazonaws.com/xiwevitox/bagezufabaxivupes.pdf
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_08734ac169154515ba725a9c77550ddd.pdf?index=true
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_6e8c77cdd4a9428d9d769aa36d098ce1.pdf?index=true
    • https://ca06489b-9cc7-4d60-8424-05bb9d91883a.filesusr.com/ugd/35b1aa_48d62480361c49aa93131a2a16e3d267.pdf?index=true
    • https://s3.amazonaws.com/xajowu/brochure_templates_for_pages_free.pdf
    • https://s3.amazonaws.com/kulinisokakewi/jemidosojetona.pdf
    • https://uploads.strikinglycdn.com/files/ef28d4b8-9a0f-4f92-9626-db4350ab35d1/how_to_arrange_numbers_in_descending_order_in_excel_using_formula.pdf
    • https://uploads.strikinglycdn.com/files/02b99e33-ec48-453b-8db7-9fcdb9d973ee/four_heroes_of_palmyna_guide.pdf
    • https://s3.amazonaws.com/nuxomigo/oral_b_replacement_heads_cross_action.pdf
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_6d99f075b18c48a4be0e112f08a3c626.pdf?index=true
    • https://s3.amazonaws.com/luworizesupox/fojateterarojepibanofa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f965.bin
ba941287b14bf2d009bc42ad24c3104ed2cfeecb7809d3b5f564e40fe933f0cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 5552 bytes
font_01_sfnt_off00010c04.bin
de078df42772a399f150eaf33e98e4f0c1795baf055950caa508c0cde3a2c71b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 11748 bytes
font_02_sfnt_off0001336c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 4324 bytes

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