Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c24bdb013fc1c72…

MALICIOUS

PDF

147.0 KB Created: 2021-03-16 07:13:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0fe444487ce88170d3d9a8e2512daee3 SHA-1: 17241d461b86888972acd4e1b2c587e58c06f76b SHA-256: 8c24bdb013fc1c72c77b82442b61cdad42883f34cd53d000e2dffb04f465bdf2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://fokemale.ru/award?keyword=waiting+for+godot+pdf+summary PDF link annotation
    • https://cdn.sqhk.co/gixedomawa/gcPjctp/world_junior_hockey_championship_2016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407989/normal_5fedad52df12a.pdfIn PDF document text
    • https://cdn.sqhk.co/vuveleni/2jjzhaG/42414952015.pdfIn PDF document text
    • http://puzobegenoneb.iblogger.org/jasasipelasebemirufavipu.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/WrihhhM/digital_marketing_associate_degree.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/ic8gjic/ringtones_for_apple_iphone_7.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/J6nEdjg/pubuje.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/heJIhwr/race_against_time_book_barnes_and_noble.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/ycjbijf/nda_2_exam_paper_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6009e960820f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_6049d69583168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491925/normal_6025dd517fa6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nubuwij.epizy.com/what_does_martin_luthers_95_theses_mean.pdfIn PDF document text
    • http://nanomunem.epizy.com/mipaludifewekelezide.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_43c9fd4e18dd41d389319d366f8bce8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/grievance_letter_for_unfair_treatment_template.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/dmv_learners_permit_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/15632521138.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/appositive_phrase_exercises_with_answers.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_a580a001204d486baa5aa03522d67e96.pdf?index=trueIn PDF document text
    • http://jazosorolanik.rf.gd/50525359130.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_ca17881cca1043aa8944d55dd37a4fec.pdf?index=trueIn 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_off000209d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209D9 5444 bytes
SHA-256: 70f0530515946b8c99787c0526daed5be77adea0012e0729f94a8511dd7d304f
font_01_sfnt_off00021c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C64 14496 bytes
SHA-256: ef5066d08ff9347c7a8f13ffe3663b1e55de05c57cc79fd18972a27a60ee1846

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