Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1723936f3b4e3c8…

MALICIOUS

PDF

85.4 KB Created: 2021-03-29 05:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b2142f1cf15028a2a8e0bfb311b45011 SHA-1: d1d3a934e3ae1d02e52bbd6fcdb4f1773b93cc7a SHA-256: d1723936f3b4e3c8773d2ad8e2710b60b13da4b58720d621fc71e299c64417e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to 'formal assessments' and the authoring application, which is likely used as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=formal+assessments+for+preschoolers PDF link annotation
    • http://nuzarekuzugav.mypressonline.com/stingless_beekeeping.pdfIn PDF document text
    • http://bipowilago.mywebcommunity.org/84321233895.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/how_to_add_photos_on_top_of_photos_on_instagrammjd1k.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/fesumerumapevatana.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/vipabenuxiviwivu.pdfIn PDF document text
    • http://trikolor.site/hyrule_warriors_legends_download_codesvv932.pdfIn PDF document text
    • http://santand-es.com/gawuzegemipukediwawevamolb29ro.pdfIn PDF document text
    • http://tosety.xyz/konuwuzupo4yqk9.pdfIn PDF document text
    • http://rubyshup.space/87707452192wr8j1.pdfIn PDF document text
    • http://akmurzina.com/how_to_make_epson_printer_print_black_onlycnec6.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/lamborghini_gallardo_performante_spyder_lp570-4i28ib.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/877f5db7.pdfIn PDF document text
    • http://vsspb.ru/8050936085srpgo.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/b2361f04653.pdfIn PDF document text
    • http://merishwheelrecords.com/persona_5_true_end_guide46scv.pdfIn PDF document text
    • http://copyrightnotice-ig.com/xebijetidxtbn.pdfIn PDF document text
    • http://hq-cleartv.info/267615059193pqsw.pdfIn PDF document text
    • http://osmosiotzs.fun/a_3_metros_sobre_el_cielo_serie_reparto_netflixc5vym.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://uploads.strikinglycdn.com/files/9bde3599-a32e-4e0d-950c-e14961dea1b9/fullstack_react_native.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1344f12-7658-4412-9e5b-c98aba20e8ba/zinogatuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a71e97a-5ae0-41c5-9c82-ad3c460d9cac/conflict_resolution_worksheets_for_students.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 4952 bytes
SHA-256: 1498aab0374ab32ce32f57272db48a206e46713d572435396fedac1bce6cf89e
font_01_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 10776 bytes
SHA-256: 39aa22d4ee1b025a3c42e4f662211f82f692777111356f6a399b26e9cedeffb4
font_02_sfnt_off000139ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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