Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aef720d86396871…

MALICIOUS

PDF

108.3 KB Created: 2021-03-09 17:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dade4de824febf229193f5a600df3b54 SHA-1: 88de021bf9c961e613af6567f5b9f1a9e7c50eb6 SHA-256: 9aef720d86396871a4b7aefbd85bbc69408cbb75a61ba891b5836727facf0d7b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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://golowaki.ru/123?utm_term=arduino+ethernet+shield+datasheet+pdf PDF link annotation
    • http://niburufajanuto.sportsontheweb.net/schwinn_210p_recumbent_bike_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409814/normal_5fdf85cae347f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_600bbc86da838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_5ff5411391065.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/how_to_do_a_manual_network_selection_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_6015c24ec0dcf.pdfIn PDF document text
    • http://setopin.mypressonline.com/negotiable_instruments_act_cheque_bounce.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/31281977089.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/alto_shaam_halo_heat.pdfIn PDF document text
    • http://gafujovinotu.22web.org/62031306981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_602b5de288199.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/john_locke_vs_rousseau_social_contract.pdfIn PDF document text
    • http://vuxilenusip.mypressonline.com/22494089533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nerezusilanake.atwebpages.com/japok.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/15406685276.pdfIn PDF document text
    • http://xizokenimufewom.atwebpages.com/rain_bird_5000_mpr_nozzle_chart.pdfIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_b6af2a3860c2460ba8c3fe16cc04c7af.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_1e192230f44844989ba11332e51c9659.pdf?index=trueIn PDF document text
    • http://tevisub.rf.gd/dd_5e_character_sheet_fillable_online.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_off00016c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C33 5120 bytes
SHA-256: 16301cb429252f3989fada73022c859a8930c096e7d4dfeda939102dfb39a7c4
font_01_sfnt_off00017d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D96 11144 bytes
SHA-256: 47857f1019c3ade692ed219751bfe99dd6733ad20837d203cb2ebca201aea9cb

Open this report in the interactive analyzer, or submit your own file for analysis.