Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1fd07d4beb3d2f…

MALICIOUS

PDF

76.2 KB Created: 2021-04-06 15:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 35ce3ed9083e3aacf9e2afd2852df0fc SHA-1: 1d39859cf5ef1283b9b808d4701f8e73d085691e SHA-256: ed1fd07d4beb3d2f299a0f6f072dae89187b25034dead9999622c576ba2f2f9f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards an attempt to lure victims to external sites for further compromise.

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://ponafet.ru/aws?utm_term=which+is+more+accurate+a1c+or+fasting+blood+glucose PDF link annotation
    • http://mavigawika.scienceontheweb.net/graco_my_ride_65_recall.pdfIn PDF document text
    • http://bupitubegedew.getenjoyment.net/crsu_b._ed_syllabus_2020_19.pdfIn PDF document text
    • http://potuduwatolebu.mywebcommunity.org/78947185715.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/vumomumima.pdfIn PDF document text
    • http://esagafow.fun/benobolokotaxoxesckgt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6034df7775d9b.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/bozugerowijaxonilokutabipay3xp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426572/normal_5ff0b2cd24614.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/iata_dangerous_goods_regulations_2015_free_download.pdfIn PDF document text
    • http://rating-bookmaker.ru/takutonufagu6ocqf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5fe412faba6b4.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/kujujux-rasimevovos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimixof.onlinewebshop.net/test_direction_examples.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_87e0573304c8400d94c36b7fae3d4e35.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_23a3514950754638a7526e6c2749fe84.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_2b345ae6864943e4bdbc96a777a14178.pdf?index=trueIn PDF document text
    • http://tefetuzuzip.myartsonline.com/harry_potter_and_the_goblet_of_fire_book_chapter_6.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_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 5640 bytes
SHA-256: 31fe0f97baebd8ab6c12700b883e56e5e3b58e25f51e45df1f8cbe6b1c8cc055
font_01_sfnt_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 10824 bytes
SHA-256: b4cc0050d4f9b29f2af3855add873d013c85848d4205f72f14498446d88acc16

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