Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bb7e44de58c6e9…

MALICIOUS

PDF

79.0 KB Created: 2021-04-15 09:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 381efd28bab9c4376c1a4c23d5000b90 SHA-1: b7600c33eadf12fcc1d871666142da4d74e0376f SHA-256: 03bb7e44de58c6e942ad6198b1265f2cd7c83878c81fa7dc2b4aa03f53594757
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that directs users to the domain 'vilenefex.ru', which is flagged as suspicious. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=past+simple+irregular+verbs+worksheet+pdf PDF link annotation
    • http://vakiduweg.mygamesonline.org/bibme_mla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_603fa0eb9143c.pdfIn PDF document text
    • http://femaxewife.getenjoyment.net/bolzano_weierstrass_theorem.pdfIn PDF document text
    • http://tapagigozi.medianewsonline.com/33146009486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_602694f726e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_60474024dfab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_603d8a3685277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499283/normal_5fdd5e1e35600.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/fajonubinomeder/p_m_r_i_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3abaaf-00b1-44e1-bf42-386ef084d8b5/bgp_configuration_example_juniper.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/baxikod.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/hp_deskjet_3050a_ink_cartridges.pdfIn PDF document text
    • http://nobapizasiwe.myartsonline.com/bosquejos_biblicos_sobre_la_familia.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/tutorial_autocad_2012_3d.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/jisaku.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/sewumikuwizudubegizab.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/aggregates_crushing_value_acv_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/70961714974.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/nelet.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/nofiwonimanupa.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/catharsis_literary_term.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f74568-07b9-4e97-b204-1a20f214ffe3/helter_skelter_movie_1976_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/high_on_love_whatsapp_status_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 5812 bytes
SHA-256: 3786209f878cd6c8f2f81c210ea46f27d547d6da7d453a5eb0bcecfbc0ec94de
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 10512 bytes
SHA-256: b44db98bd202da510fda93872c9b274e4c2b233e053baec36566db8b90a72985
font_02_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 16060 bytes
SHA-256: d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72

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