Malicious PDF — malware analysis report

Static analysis result for SHA-256 64774bba6c5681ac…

MALICIOUS

PDF

72.0 KB Created: 2021-03-31 20:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 2a602f4481337e52740b68e834ad03b2 SHA-1: 91287df2e534c894b6a18f58087d2410027d7ceb SHA-256: 64774bba6c5681ac1f9f30e94bfbe2d214cb5f6334cb07b925f7791ee1bc7606
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm for SEO manipulation or content distribution. ClamAV and ML heuristics flagged this PDF as malicious, with the ML classifier outputting a high probability of maliciousness. The embedded URLs suggest a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8215

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.
  • 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
  • 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://maypoin.ru/award?keyword=best+spoken+english+book+for+beginners+pdf PDF link annotation
    • http://flowerport.market/i_found_amber_run_piano47nnd.pdfIn PDF document text
    • http://myluckybet.xyz/wejonom7asyl.pdfIn PDF document text
    • http://jubigorut.iblogger.org/zemupaforeketapa.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/76778287985gqhho.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/basic_mud_logging_manual.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/57869265406.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/a148b088-dd99-4172-80ff-ae2f552b8eca/blues_guitar_scales_for_beginners.pdfIn PDF document text
    • https://13a2bf7a-7930-4518-a7e6-737bf3c0aa4f.filesusr.com/ugd/f5c1a0_fb1fd62a7bb043d9ba40d213f86eb893.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00239022-dfdc-4df2-91d6-6bdd19d2d33f/ninijetinumenewi.pdfIn PDF document text
    • http://bosagiriwamokin.onlinewebshop.net/list_of_quantitative_aptitude_formulas.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_1f864b4801da450c8a4a3cd1ce5bb7ed.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_9b9e97eeccb44c0ea8563c5b042354a8.pdf?index=trueIn PDF document text
    • https://151dec52-cf20-477b-a401-a68195eead79.filesusr.com/ugd/8538f4_3c0c0f162f544800a27fdd536acba715.pdf?index=trueIn PDF document text
    • https://e9542b43-fb79-4c62-94a9-c66526381fce.filesusr.com/ugd/4142f3_123f6b250bb94e99955543be3ad9141a.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_e6c00b84dff84f849d97223ecac5f44c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db88882-2c7c-47c0-a256-c3cdd6b24a51/madaloguduvimule.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_dec27b60fc014362a9bd71e32e8da8aa.pdf?index=trueIn PDF document text
    • http://dejogamolefip.rf.gd/savutovojipubilukagot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5070a3d-ab0c-47c7-b15d-d19916bda44c/55201373049.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 5348 bytes
SHA-256: bf91a86e0f3ddbad6cfc7b952842b73dad47d83e3f75e67ed761c89edf117467

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