Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5a3915f937f927…

MALICIOUS

PDF

84.4 KB Created: 2021-03-17 02:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c53f97c54fcb9929cbf38369f3eed7fa SHA-1: 3ef1587542814fa6e100642ebbdd67e3c8aabdcc SHA-256: 6b5a3915f937f9275fdd5283c110b269a4e9cc9b3d52fc1b8cf5f96ef62f3ec9
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs to a suspicious domain, likely intended to host a malicious payload or phishing page. The document body, though heavily obfuscated, appears to be a lure related to a book review, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wb?keyword=rick%20riordan%20the%20tyrant PDF link annotation
    • http://kurutog.mygamesonline.org/kaxaxojarikisexasidatofeg.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/post_office_ssa_account_balance_check.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/vanosi.pdfIn PDF document text
    • http://trenketo.buzz/what_should_be_included_in_an_essay_outline9m0on.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/dupiromajez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_6039027b83d69.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/the_language_of_composition_second_edition_teachers_edition.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/adaptive_features_of_plants_in_forest_habitat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_6041b81322226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_5fdc7d2df353a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470841/normal_5ff4a45c7b92e.pdfIn PDF document text
    • http://nicepics.xyz/3824730574344p6s.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/how_to_lie_with_statistics_chapter_1_summary.pdfIn PDF document text
    • http://feelslike35.com/arteriovenous_malformation_of_cerebral_vessels_icd_10hc489.pdfIn PDF document text
    • http://50offstore.info/kagepo45j5o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_60270ee6c6dfd.pdfIn PDF document text
    • http://savineme.mywebcommunity.org/sikagolupebokuzanunileru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bogijexu/silegidokafesurazozate.pdfIn PDF document text
    • http://moxosutemow.onlinewebshop.net/tnpsc_medical_fitness_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/vuwajapurigozem.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/give_2_negative_effects_of_volcanic_eruption.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/babeneluv.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/61610132106.pdfIn PDF document text
    • http://manuwakagekewu.onlinewebshop.net/bukekevifutagegutobigin.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_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 5644 bytes
SHA-256: 90851db83b216f3aa93419cb1ffb50cd7a6a413a5b96d812e9a5aa33950fee77
font_01_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 10916 bytes
SHA-256: d5eee2694fe8cfdc2e9b1890fd3ed5810afc2317c7286b0ad2fe541f3371c750

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