Malicious PDF — malware analysis report

Static analysis result for SHA-256 746676ab067f10d2…

MALICIOUS

PDF

109.3 KB Created: 2021-03-12 17:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 85088bc8bd7a916d116ec75f9e89acf5 SHA-1: b124f50f6a5d8da10f3ad0d48da0476357f207e3 SHA-256: 746676ab067f10d2cf179f9b6f87bcfc2e3ab32691fe62c6212dc6c57a5262da
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm hosted on disposable domains. The primary malicious activity appears to be redirecting users to external websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://nipisod.ru/award?keyword=marxist+dialectics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460723/normal_60201ee3063de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465127/normal_5fc64150adad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_6046074d59ee4.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/pubosaxelabeligivojugosak1ul99.pdfIn PDF document text
    • http://rukunikuxajosog.22web.org/27957724248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6039a8643c0fa.pdfIn PDF document text
    • http://uabiomanix.xyz/suzowemiswmwxn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492593/normal_601a2e2fdc5e0.pdfIn PDF document text
    • http://lodijijewotiviw.iblogger.org/consequentialism_theory.pdfIn PDF document text
    • http://fuviguz.22web.org/bizawizisuwil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sezirinizisa.rf.gd/yayati_kadambari_marathi.pdfIn PDF document text
    • http://vefagukolile.epizy.com/27457103933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363b07e9-6779-4ba5-9d48-60748ee1d69a/32525287392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9e5e8c-9956-48d1-81fc-a2326bf3a7bc/87738313703.pdfIn PDF document text
    • http://fedatowuka.epizy.com/wwe_nxt_grades_bleacher_report.pdfIn PDF document text
    • http://vekujekodabudu.epizy.com/7460179773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bccf4e68-0914-484d-b2f2-e1c498439b54/rounding_decimals_word_problems_worksheet_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb0d148-b3ef-49fd-8f3e-6a005b4ed370/29600192373.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/80916358716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fc1161-f905-444a-be53-8014218f02f7/aws_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBD 5220 bytes
SHA-256: f195a2f530b56366948cf1b70e6ac34574d615bededf9714dfa20210b7fbb4b3
font_01_sfnt_off000181a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A2 11448 bytes
SHA-256: da367be18bf42bbff59c810d6ba4c1d68810bf47dbf334b1b2c99b434ae2b5fd

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