Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3f94ecf7cf6b75…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 04:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 431da75c6d97d35826a9eb391733e60b SHA-1: d42037c077e480d862cb4322da0b30ccf4305f60 SHA-256: 5e3f94ecf7cf6b75fe7b05680c0b0f995f81977e1ba05286e859f2a79f395be0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs pointing to domains like 'xezojetit.ru' suggests an attempt to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=kinesiology+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452389/normal_5fc65d54b43cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451556/normal_603551af0e2b0.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/napaxapaxumumilugomolitog.pdfIn PDF document text
    • http://elinekici.online/nujozafovixakapubelaq53iu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_6046d54cca311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fecee9fa39e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_6039fde7aa634.pdfIn PDF document text
    • http://everydays.space/wiroverawu0p9j5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwozoma.epizy.com/monuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37466efd-ecd7-4aaf-a8f1-100efeecb7cb/54476311663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5db747d-4d85-439a-8fc8-aa9768eefe7e/bebodamijevevufiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa75f702-a6f6-4442-9cbb-0079b13d7080/energizer_battery_charger_manual_chfc_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0303df98-fb9c-4397-b698-1017e0b07024/whirlpool_washer_error_code_f6_e2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a456165-d9ea-43a6-86f1-db070fd46c7e/what_is_most_responsible_for_creating_rhythm_in_a_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42255ef2-e854-4371-80b2-42e0a48029fe/sezev.pdfIn PDF document text
    • http://bonipoja.epizy.com/building_construction_materials_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb8067c-673b-45f6-8885-ef343488eff6/feganobeziduwefusigeses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39db8d9-a420-45ab-9919-829fdd06c25e/ps3_controller_battery_price_south_africa.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_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 4756 bytes
SHA-256: c24a758fd12b7cf2939c81cd4c12c88b0253f489ccc75e3d7d14a2549015059e
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 11332 bytes
SHA-256: 8a8367b686b4eb5493cc6242c6db42c1274e573cbc1fdd1949297ed23d9d6c14

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