Malicious PDF — malware analysis report

Static analysis result for SHA-256 e367e750be07ebdc…

MALICIOUS

PDF

74.0 KB Created: 2021-03-15 00:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a270270c57e378c1681d6249dcbfa092 SHA-1: 9601325a1eb837c6a09a170ced243028b13b3631 SHA-256: e367e750be07ebdc7e6b2ec10b18b474cdf5681a7a4cd88a29573073bb9905db
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though truncated and obfuscated, appears to be a lure related to a book title, aiming to trick users into clicking the malicious link.

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 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://midufefew.ru/award?keyword=biostatistics+for+the+biological+and+health+sciences+1st+edition+pdf PDF link annotation
    • http://xemizawufogutuf.scienceontheweb.net/entry_level_cloud_computing_jobs_london.pdfIn PDF document text
    • http://50offit.pro/mafupigustaf79.pdfIn PDF document text
    • http://gibelepij.scienceontheweb.net/consenso_asma_pediatria.pdfIn PDF document text
    • http://mx50off.info/night_relaxing_jelly_eye_sheet_maskjx618.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/f22d197e-5a41-4ef9-8882-c7a778363c8c/glencoe_street_law_a_course_in_practical_law_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91042ad-6b90-412b-ba66-2adbb9d915dc/sefotanobutosasujem.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_f9c0ba818f3245cd90a9cf81ba2a41e4.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_608baa6af276495e8466b077d9341113.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed57f92f-46e4-4b9a-87e8-51e8d5ac1d0d/brother_mfc-9130cw_reset_drum_counter.pdfIn PDF document text
    • http://wukevivetarapu.myartsonline.com/67342079709.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/saucony_running_shoes_guide_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/types_of_freshwater_ecosystem.pdfIn PDF document text
    • http://wenibeliso.atwebpages.com/jovipajiralilijanatar.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_d925fbf25a47473787efb516c291471a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29cb385-ebdc-4ae3-bd0b-8954479a25a1/31952630114.pdfIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/cognitive_archeology.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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 5660 bytes
SHA-256: 79502d72d1a06331b78d4cc826a814b1ca8bbe9f26331038826c8fa3914aaadb
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 11056 bytes
SHA-256: 13550f300a722b57c6fe8c1d5d130161e9752167fe569e142f20217d179880c6

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