Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf889881da73e7f5…

MALICIOUS

PDF

76.1 KB Created: 2021-02-22 16:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8c28b0998a49312d233ce4614ecafd25 SHA-1: 5634edca574b27df98106a7e8d6ba6552da857a5 SHA-256: cf889881da73e7f5f2b21d485c4c008fe37db47426c634942656675a53a481c7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/wix?keyword=letter+of+financial+responsibility+for+a+person PDF link annotation
    • http://gezilobogobig.22web.org/tekarinuwuvorepetode.pdfIn PDF document text
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/felobijukuz_judelat_najus.pdfIn PDF document text
    • http://midokasek.iblogger.org/86901637147.pdfIn PDF document text
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/37cd99.pdfIn PDF document text
    • https://ludugekokokak.weebly.com/uploads/1/3/5/3/135313409/lugav_janigewaxuguj_xedonot.pdfIn PDF document text
    • http://josigowuwerojov.iblogger.org/the_aeneid_book_1_and_2_summary.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/5544133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xagevudogitoti.epizy.com/managerial_reports_include.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/derivatives_rules_cheat_sheet.pdfIn PDF document text
    • http://povuputuk.epizy.com/carriers_2009_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/unlock_bootloader_sony_xperia_x_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/faxoridut.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/64819871121.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/didoxujoxak.pdfIn PDF document text
    • http://waxaravibew.epizy.com/hr_fresher_interview_questions_and_answers.pdfIn PDF document text
    • http://wakafovoda.epizy.com/adhd_medication_guide_2019.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/dublin_breeches_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/jogos_android_com_dinheiro_infinito.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 5192 bytes
SHA-256: 749b69bad6d4d1aab0dd830cef4c07c148015458ffde3f2ad7957a158e6f97cd
font_01_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 10440 bytes
SHA-256: a9b126cdfae8427699ab40ca81c742c930503d19d6f378851d69105c79cc6214

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