Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a8f3c44bedb90c…

MALICIOUS

PDF

84.6 KB Created: 2021-05-12 06:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3dfb83d43db1138427b2311b13e03db1 SHA-1: ede92812b83bf9568f5f4c25bc9240841ad4d460 SHA-256: 56a8f3c44bedb90c0cd4f9e44f776ed862ad69456253bd4b8d413e3b1a03bd2d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=fundamentos+del+voleibol+bloqueo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459479/normal_602fbcc9b7d78.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/jo8G6hc/84669286901.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/95030691473.pdfIn PDF document text
    • http://lazakefezives.mygamesonline.org/argos_catalogue_1985.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/jcGIXBK/word_chums_cheat_project_lexicon.pdfIn PDF document text
    • https://cdn.sqhk.co/derilunadine/hiiojhp/xosiluromevinidox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_60433666a2bba.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/ibjgid1/sewobisazininetegopomitug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_6005870f69969.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://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_d9a76aad90e54cf98a7c01a82d1e6736.pdf?index=trueIn PDF document text
    • http://wisexek.epizy.com/matching_point_bioassay_procedure.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_0328a5da45d749abb37d74d52b080c74.pdf?index=trueIn PDF document text
    • http://xulisaj.rf.gd/all_maths_formulas_for_class_9_cbse_download.pdfIn PDF document text
    • http://kevarivujez.rf.gd/93905111193.pdfIn PDF document text
    • http://fodapimogu.rf.gd/photoshop_cs5_mac.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_ac004ef698fc466692b00eddddbf9f32.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_494d24b500fe413e83168b4a0bc6051d.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 5036 bytes
SHA-256: 34fabeba8d226d93c8cbbc37ba20126ffe75f5bf728362fa39a306b0726a48a4
font_01_sfnt_off0001118b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 10868 bytes
SHA-256: f8c2052c997cd3f0741493fc076aea45b19fd533119a4eb7cfa989fea4266f24
font_02_sfnt_off00013506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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