Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1d7e9c151d3ad4…

MALICIOUS

PDF

68.6 KB Created: 2021-05-14 14:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aa196b4b50fd8656df786ee4928bfd2b SHA-1: 24f3933aebd98f0a0b9cf06f613a6611dd0edce2 SHA-256: dc1d7e9c151d3ad4028d4ebe9faed4aaaf3eead2883ef1cfb3fb24105f5e4871
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://bologen.ru/strik?utm_term=nikita+gill+book+your+soul+is+a+river+pdf PDF link annotation
    • http://idealica-italiaoficial.site/e_tickets_delta_airlinesin5wr.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/tijibugorejoma-sorurixur.pdfIn PDF document text
    • http://segway-wheelchair.ru/hoover_f59149rm_partss6tpv.pdfIn PDF document text
    • http://momentikshop.space/lifafejuxanadomuklzouw.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/40140450336.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/e633645bfe63.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/ed78ace703dcd.pdfIn PDF document text
    • https://pinabufibofux.weebly.com/uploads/1/3/2/6/132682338/rotagiru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luderaguzafa.epizy.com/how_long_is_ham_radio_license_good_for.pdfIn PDF document text
    • http://bidetorula.rf.gd/para_que_sirve_el_acido_clorhidrico_en_el_estomago.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/12763258025.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/best_ap_language_and_composition_review_book_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/texojaxuwufejirilis.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/grade_9_science_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/abac_university_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/tijikelav.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/dadarotef.pdfIn PDF document text
    • http://talagamezibupip.epizy.com/zesofovanisu.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_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 5544 bytes
SHA-256: 42465517c9d41f54a99c2c094cf6f864292537a0738569b03f901bb0766c4ef4
font_01_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 12112 bytes
SHA-256: 2dc17c1399d2f91668b39332ac8060fe8166f92bce461c9a13b28b84478f8245