Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2641a07c5fd33a7…

MALICIOUS

PDF

77.1 KB Created: 2021-05-19 22:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fe7799cf4244afbed0fc0a37dfacf512 SHA-1: 3fdd1c19518411afc591f642dab301b2c65bbe08 SHA-256: b2641a07c5fd33a7a774698903ffc663f1e76a1bfee6b2852a53969c816edf00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, with one pointing to 'https://xezojetit.ru/strik?utm_term=isotopes+and+atomic+mass+phet+answer+key', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://xezojetit.ru/strik?utm_term=isotopes+and+atomic+mass+phet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405208/normal_60063456df68f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470526/normal_604ccf4385b13.pdfIn PDF document text
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/4ed05da099f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_6010f1cc69dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_6049c70b35d59.pdfIn PDF document text
    • https://dusitibepilezu.weebly.com/uploads/1/3/1/4/131437978/671774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5fef1af06308d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7579b19a-fde5-4b0b-a9ef-3628178ad6fb/86244400168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3425070-0959-434e-806e-521eb459f259/landice_treadmill_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f620566-6b68-469e-95bf-ce2f6630713b/briggs_and_stratton_12.5_hp_engine_repair_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1697a3b0-0139-43ff-8d95-cd9766b57f74/how_to_calculate_discrete_probability_distribution_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4526af08-6fda-4696-9f05-7fdd3210f41d/what_was_the_purpose_of_a_salon_during_the_enlightenment_movement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ed5a1c-8c6d-494a-8e1f-02ae7641c798/23537078317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb06b623-0128-42a7-8a7c-8c7ed46529fb/63423868515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe9ff0a-357d-4bd8-9036-43db1ae3f72e/76414527134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ef4354-dc75-4910-b4b2-c09ee565dfa1/stochastic_calculus_for_finance_shreve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de72e9d1-61e9-40cd-b674-3b7ecb9ebd19/when_to_answer_a_guys_text.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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 5476 bytes
SHA-256: f6958b9778533052f0fe7e57cfa05f87b694c79cd94ae8da4168a6f4dbc8802f
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 11180 bytes
SHA-256: 180748ce9b1e6fb85270343dfd94c35a64382c29dc84df681f53459dda72ecea

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