Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dea648e54660c5…

MALICIOUS

PDF

79.6 KB Created: 2021-05-16 05:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 19e17a568153dfc7d3ec93797ac3664c SHA-1: 22a5a8ff69a8713eed2ea82618a30facf13f1fa7 SHA-256: e4dea648e54660c58542e186d4feff8223033ba12e837ab889237b8f43b48c28
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a PDF phishing trojan. It contains numerous embedded URLs, with one prominent URL, 'https://kuzutuzo.ru/strik?utm_term=alesis+dm10+mkii+pro+update', being flagged as external. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for links, suggesting an attempt to obscure the true malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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://kuzutuzo.ru/strik?utm_term=alesis+dm10+mkii+pro+update PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418185/normal_604e43d84f46d.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/death_note_movie_l_change_the_world.pdfIn PDF document text
    • http://wemigime.iblogger.org/cerumen_impaction_patient_education.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/veladaralaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_6015b7304fff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_5fd16d9bbcfcc.pdfIn PDF document text
    • http://bilapak.66ghz.com/bupirafeboterarivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jegowijuvu.epizy.com/adobe_ps_touch_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/endocarditis_antibiotic_prophylaxis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/73079638292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39c35d7-4139-47d4-89b0-0a08806897a2/how_to_factory_reset_garmin_forerunner_920xt.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/20058915195.pdfIn PDF document text
    • http://tojopoxirer.rf.gd/sound_wave_equation.pdfIn PDF document text
    • http://sarowagilujet.rf.gd/lopuware.pdfIn PDF document text
    • http://nenufun.rf.gd/19390782146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f77e3e-d595-4392-8fc4-4b54a5fb1188/a_scanner_darkly_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a22b10-9e2d-4650-8507-e2f02684e404/kolim.pdfIn PDF document text
    • http://museduzapotu.epizy.com/kirasexudepexiza.pdfIn PDF document text
    • http://demuwesax.epizy.com/modarun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29aef233-cca2-4aaa-999d-de72c06b1f4e/maforivujel.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_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 5352 bytes
SHA-256: cc2dd51a05bcbe88f962e906154a0aaf4f0524261df90dd799a9bc4a2e7b643a
font_01_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 11524 bytes
SHA-256: 6eb9739724767c1310c715c6ea8b22e421c6c4901222c7d3aa1a89b1d062d400

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