Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f85e036b593b05c…

MALICIOUS

PDF

77.6 KB Created: 2021-02-22 14:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ba0750678f21d19995d9c57de23e15b4 SHA-1: 25778be68973930c95250027d8b2bdd293007b0d SHA-256: 9f85e036b593b05ce5d9a0d62580b4e58549ec1980d6a915df75e375985ed09b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The primary URL, https://seumenha.ru/strik, is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://seumenha.ru/strik?utm_term=charlie+munger+quotes+100k PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5fe752a0c8853.pdfIn PDF document text
    • http://vududodudo.22web.org/how_to_adjust_delta_monitor_shower_valve.pdfIn PDF document text
    • http://josebixotarez.22web.org/nunejetolaponebef.pdfIn PDF document text
    • http://niwanusunig.22web.org/devulanavedeg.pdfIn PDF document text
    • http://gawoxubut.22web.org/50445431727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_6012656abff22.pdfIn PDF document text
    • https://goginaderexikez.weebly.com/uploads/1/3/5/3/135306094/jowepoliv.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/python_list_comprehension_for_loop_performance.pdfIn PDF document text
    • https://zefijevizo.weebly.com/uploads/1/3/2/3/132302816/kutoravadegix.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://s3.amazonaws.com/gagotaniwipure/givozapuruxeluliwusuzu.pdfIn PDF document text
    • http://zawomebi.epizy.com/76922844140.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/akreditasi_puskesmas_bab_8.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/collage_maker_pic_grid_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/28289221629.pdfIn PDF document text
    • http://serinuzosazojup.epizy.com/what_is_modern_management_approach.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/73714013520.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/90123098969.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/devops_engineer_interview_questions_and_answers.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_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 5388 bytes
SHA-256: ffd7ac0f9a5ac12b0668e4553fc6ee0883176e3c92997561f2304a9d57ce7ee2
font_01_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 10756 bytes
SHA-256: ef12e9a5a3e9fdc4ffb043d3d10c53cf83f4259a124bfb74d31ecbb2382d3f0c
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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