Malicious PDF — malware analysis report

Static analysis result for SHA-256 f270a718ab5d8355…

MALICIOUS

PDF

86.3 KB Created: 2021-04-23 04:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4dee274ecd4d801bcba98b5aa42e5f9f SHA-1: c983cbe7a8a04a32f1b0224578ae8192837b1ae8 SHA-256: f270a718ab5d835587cee6e92366110aef972be0cd5624182af3a42a0cfad46e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. The embedded URLs and the heuristic firings like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were directly extracted, the PDF structure and external link behavior align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/strik?utm_term=how+to+take+apart+kenmore+600+series+washer PDF link annotation
    • https://cdn.sqhk.co/xegogeji/SjdjflD/5718858344.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/Q5pKBjf/lamolomopijebiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_0fe565563030410da529cac1e235e2b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef6e92f-1dc8-4a85-8f32-fcb3cff72e41/how_to_connect_canon_pixma_printer_to_wireless_network.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_5cee26ac32ee4685ba3bb5997a80c358.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_89aefa5ac8804f8c90731be15a519e19.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_cf387744fc2142f2b2f4a07ac03ce138.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2bfe94-ba84-420a-810b-eaf7b4b323e5/balancing_equations_worksheet_answers_1-20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6498d929-bbe0-4e21-86a2-81f891184af9/71789961342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167b94b0-2e39-46b6-b147-3c8ebb7ff206/tagafezudufuxiwejo.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_79d4dcde3c154e15a27f77f6ce7d3058.pdf?index=trueIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_75ee0ba60fa54ec7b0fbf2a40e3a7bab.pdf?index=trueIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_7f10d962138d4198bb0de837f27610ed.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_f8f2f2fb3ff441cdbb3320f1e5a2b47d.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_82970c3c833e47239e196eff12dd1202.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5acf7ad7-1bf8-4ceb-9dd0-8a30a8f66d09/sample_student_information_sheet_for_teachers.pdfIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_632556575f72446ead1d14802291cd1c.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_e7deb61ccc954da3aa73b24ba2685143.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 5228 bytes
SHA-256: 50944decf2dc29ed9fafa4bb6a3697f387f155812049bcf3057a17091f98585a
font_01_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 12092 bytes
SHA-256: 9d708b0b117f4ebeb3fc421acb1f03bd04cb3fc17631664a1a60990801f58138
font_02_sfnt_off00013dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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