Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15f3fc2b6258911…

MALICIOUS

PDF

130.4 KB Created: 2021-03-31 19:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a482779598cffaa61bdd577a37b41741 SHA-1: 046c281cc21c42505c23152344c45eb4d6176ad0 SHA-256: a15f3fc2b62589111f3a5b8260a41db60c086a50b76f0e1ff4fe45efb7fe3dab
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+train+your+dragon+reading+order PDF link annotation
    • http://xezixaz.getenjoyment.net/53075353444.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/dOieRij/tenokusudagevawef.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/jain_agamas.pdfIn PDF document text
    • http://peteferix.mypressonline.com/how_to_code_finite_element_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/ntjijfj/58286668129.pdfIn PDF document text
    • https://cdn.sqhk.co/farukisinu/fCjcEhf/irregular_nouns_worksheet_for_grade_5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_e2fcd177819f4cc7807d7939fac58bd0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d12d172-c565-4923-89b3-80c5d502ac06/ariens_st824_carburetor_clean.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_0984f5038b364d918cc5c5018661e95c.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_df8bc9d72bd6407298057a9ddc6a4ead.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_3098b0dc13e147c2901137ddb69aa671.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/norakiserinu.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_7dd6ba855f5d4d99886c36b030cc7a16.pdf?index=trueIn PDF document text
    • https://850a1920-2731-4717-9c72-6fe6783ae8b2.filesusr.com/ugd/2d1648_fca42bb1bbad44a7ad398efb4972d3a9.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_2105063ceac74d74b0acc3f70693d5dd.pdf?index=trueIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/panasonic_inverter_microwave_oven_h97_h98_repair_fix.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/76679138776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d51002e-46bc-4099-a984-35cdbd1a974a/90779292747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa3d006-163f-45e3-bc20-83b9726d1970/tutubuzemero.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/poe_syndicate_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/lightroom_mobile_presets_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C404 4940 bytes
SHA-256: 89ceda0224aeb5acbe09849610cc889edde41e61dd01890270fb4cce3dc9e9ac
font_01_sfnt_off0001d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4F7 11308 bytes
SHA-256: 7421c99307c5f13e8cfcb7f7809e2d37ce461cf92f2c1076bd25f04011004e9a