Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fdb78df44b5b6b…

MALICIOUS

PDF

79.3 KB Created: 2021-03-19 13:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5d71a2ddd4e4c7a8a56b591737822a3a SHA-1: f197cef81cee1f7acd49cbc7971cf12dc6e2f61b SHA-256: 43fdb78df44b5b6b119de2ab285d31823ccfb7bfc3b5c0e590c7c56d6624da27
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting pointing to a URL that appears to be a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=teaching+methods+and+strategies+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415331/normal_602e05a0f3704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_601d4c4bc9fc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fec830d19cbd.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/bafemuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387412/normal_5ffe74b6d50d8.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/872649359.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/los_chakras_de_la_tierra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485569/normal_600292bf7cdc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_604a5dab25c5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420599/normal_5ff75798d0c4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojazudawawuse.epizy.com/why_is_the_brush_not_spinning_on_my_shark_vacuum.pdfIn PDF document text
    • http://lekinip.epizy.com/lotijonux.pdfIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/53306280171.pdfIn PDF document text
    • http://vixadit.rf.gd/neufert_architecture_book_free_download.pdfIn PDF document text
    • http://ferodibev.onlinewebshop.net/jatirobusokifakika.pdfIn PDF document text
    • http://noxukimu.myartsonline.com/symmetry_math_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/27005338559.pdfIn PDF document text
    • http://womawujun.atwebpages.com/harper_biochemistry_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/char_broil_electric_grill_lowes.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/pulofobijapij.pdfIn PDF document text
    • http://bizujexexo.epizy.com/8384949424.pdfIn PDF document text
    • http://gozuketitara.onlinewebshop.net/how_long_to_cook_a_20_pound_stuffed_turkey_in_a_roaster_oven.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_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 5488 bytes
SHA-256: a66bdcff85264d0b291271fcaddcda254d57e6aafb2f4fa7f2f3e3c3ce5ea2be
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 11432 bytes
SHA-256: e4c6253c1e7fd361ec03f5ae1af6e862bd1e90870795bf0c084ea75883352c8d

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