Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2cf82f46a9d3a5…

MALICIOUS

PDF

84.4 KB Created: 2021-03-29 06:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51337435f1b583a037a455269c191d96 SHA-1: 4ebdb73b387cdddaa45614710bde3c6cbf34ea5d SHA-256: 7d2cf82f46a9d3a517f060e26b71efc3bb5e12630e005535149715b5b8d67861
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to a link farm hosted on weebly.com, suggesting an SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/award?keyword=wood+toolbox+plans+pdf
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/3558b.pdf
    • http://xevamoz.mygamesonline.org/sentimental_journey_lyrics.pdf
    • http://mevakimuvu.mypressonline.com/77058229451.pdf
    • https://lutowixo.weebly.com/uploads/1/3/4/7/134705225/514f22393714.pdf
    • http://zaparipajomigi.scienceontheweb.net/jidegipipulo.pdf
    • http://rubewox.sportsontheweb.net/65338352623.pdf
    • https://xovixonu.weebly.com/uploads/1/3/4/8/134896571/7ad067ffe5.pdf
    • http://xukazuleje.iblogger.org/10342870638.pdf
    • https://fubafutevulaz.weebly.com/uploads/1/3/1/8/131856433/910596caa53d59.pdf
    • https://rajotabew.weebly.com/uploads/1/3/4/3/134360909/8265449.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vamanufa.rf.gd/dowusoxafoguzaka.pdf
    • https://uploads.strikinglycdn.com/files/b6e669e4-0f55-4060-8215-0affccfc91a4/extending_the_linear_model_with_r_second_edition_solutions.pdf
    • https://uploads.strikinglycdn.com/files/9ea14202-2796-419b-ac95-3a268240a9e9/bebopodavusedokiga.pdf
    • http://zuzitubop.rf.gd/miller_bobcat_250_diesel.pdf
    • http://telusomabufa.onlinewebshop.net/fe_reference_handbook_10.0.pdf
    • https://s3.amazonaws.com/nitidadufetenu/felawufusukowoketox.pdf
    • https://uploads.strikinglycdn.com/files/14d25711-7e6d-44dc-8c70-8c92ef74c65e/13790208548.pdf
    • https://s3.amazonaws.com/ximupuv/what_to_do_if_someone_calls_you_a_snitch.pdf
    • https://uploads.strikinglycdn.com/files/8883a762-1ee9-43e0-b088-6bd53dab5497/60940978954.pdf
    • https://uploads.strikinglycdn.com/files/5786d56d-882c-4668-b09a-3b430c2095ef/62528561502.pdf
    • https://uploads.strikinglycdn.com/files/e1bfdee3-5c2f-4022-a9f0-81a6cbc8c9e6/introduction_to_computers_questions.pdf
    • https://s3.amazonaws.com/dudujopixejikug/article_1315_du_code_civil_rforme.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c37.bin
a33cb8b7bb409831c0b02aaab721f4137505d164d9a3586a392b159eb2f6de63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 5160 bytes
font_01_sfnt_off00011de6.bin
75e13cb107f094050fe5a465c450ac049005cd0a9729df0a69df01de2906465b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 11136 bytes

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