Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f4d279719f6234…

MALICIOUS

PDF

85.6 KB Created: 2021-06-12 15:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 538bbd24320365d28452be0e800266e8 SHA-1: cfc91ccf079d674219786b8e0578fa1b876a7648 SHA-256: 86f4d279719f6234168885a8b9b862b6d95fe9a00fa60e3b3b6fe217cd52470b
126 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is a suspicious URL that appears to be part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/pbw?utm_term=the+thief+story+class+10+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450502/normal_60286aaa7ff85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_6051b930da4f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392868/normal_5fff6dff635d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448539/normal_5fe30b549cd68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_6058d644a827f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_6027eff8a7ee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_6052a8005cbca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_60ba5472a4faf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_5fcc5f76b71cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_600ba76170085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_60c117e463ea9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/145123176/acide_sulfurique_livre.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/ugc_net_political_science_books_in_hindi_free_download.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/rogejijilopanirosoparufe.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144475332/68328390940.pdfIn PDF document text
    • http://nibokuwogi.pbworks.com/f/kaxiwupurunezuk.pdfIn PDF document text
    • http://milatufed.pbworks.com/f/lkg_tamil_movie_download_hd_1080p.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/83638911321.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144656052/module_4_investing_test_answer_key.pdfIn PDF document text
    • http://nonesupul.pbworks.com/f/applications_of_partial_differential_equations_in_daily_life_ppt.pdfIn PDF document text
    • http://wurutaw.pbworks.com/f/satimipid.pdfIn PDF document text
    • http://fafevupu.pbworks.com/w/file/fetch/144743733/do_pill_bugs_eat_strawberries.pdfIn PDF document text
    • http://febigadeviti.pbworks.com/f/74285062887.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_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 5488 bytes
SHA-256: d8af2699acd61b6a44be5270e900efb8897a05854832990e96943df66fdc4ca8
font_01_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 10576 bytes
SHA-256: cd6b620eeae1fa4bd99769cefd1c00292c6fa0ec239e4f315e51affc0fc8db62

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