Malicious PDF — malware analysis report

Static analysis result for SHA-256 651888541b0460dc…

MALICIOUS

PDF

78.6 KB Created: 2021-03-04 07:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f0dda68694345e2d8a4b21fa2ea22f52 SHA-1: 99a9346100d135bfe9ac691edb045cbb3fb689b7 SHA-256: 651888541b0460dc451e0653d975797933a6bdf42d75c6cc6599ff2c480e7310
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=christmas+carol+jim+carrey+film PDF link annotation
    • http://kunepuvobimamin.medianewsonline.com/etica_para_amador_libro_resumen_por_capitulos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_601c8d836e19a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447447/normal_6000099b6b369.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/xetunejasete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_603d33e62603b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_60406c17a78bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_60241f3f8c7ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502920/normal_5fe2598466c24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofaxafogi.myartsonline.com/basic_electrical_engineering_vtu.pdfIn PDF document text
    • http://bususetut.epizy.com/va_dmv_driving_test_study_guide.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/crochet_hat_patterns_video.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/47064775405.pdfIn PDF document text
    • http://gamovomubapo.rf.gd/castlevania_symphony_of_the_night_speedrun_guide.pdfIn PDF document text
    • http://relogevavikidid.epizy.com/i_am_barbie_girl_song_320kbps.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_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 5204 bytes
SHA-256: 91f6cdbfeeaad242e4e668dfe36d1a5d8a773ca627e443f25314a6471a5d8223
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 11500 bytes
SHA-256: 45267c367f74408b5eaadab7dcd135958941b3100d16b6fb518f611857203553

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