Malicious PDF — malware analysis report

Static analysis result for SHA-256 5462ff4f47615a45…

MALICIOUS

PDF

83.7 KB Created: 2021-04-06 23:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a16801f76f7559f878f5e9f892d6bb72 SHA-1: eb6ec6daf783ca2d7f4879924d97d0407cc29594 SHA-256: 5462ff4f47615a45ea4a0ad630258ac0a7fa35a62e3ac6e864cd4ddc9fc42e09
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with several pointing to domains flagged as potentially malicious or associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF as a collection of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=font+awesome+5+icons+pdf PDF link annotation
    • http://fsfsfd.xyz/definicion_de_calor_cedido_y_absorbido_por_los_cuerposvbi2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_6018c1fa5b0d9.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/68928290919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_605c3a2803365.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/sakagub.pdfIn PDF document text
    • http://wixedorozed.iblogger.org/caracteristicas_del_ensayo_argumentativo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368471/normal_5fdf395c8112b.pdfIn PDF document text
    • http://rotukefune.getenjoyment.net/addressing_modes_types.pdfIn PDF document text
    • http://shop-kid-toys.online/how_to_program_a_clicker_clk1_keypadbm97x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_6066f771242a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472200/normal_5fdb24b1ce7ab.pdfIn PDF document text
    • http://procripton.com/the_end_of_the_f_world_trailer_season_1i05bj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6cdd30c-cc05-4442-b119-1d15a93cfe0d/mumoxole.pdfIn PDF document text
    • http://jipokogave.epizy.com/vegopoxusoz.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/xubajeridutuzapofufotix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb7fa23-bf17-4a1c-9496-4546958ace00/dell_optiplex_390_ram_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e263a81d-e345-440b-b2c1-8682baf6a8b7/30589641773.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/suratobuwi.pdfIn PDF document text
    • http://fevumuweli.rf.gd/39936920850.pdfIn PDF document text
    • http://gixopiv.onlinewebshop.net/cardo_santo_propiedades.pdfIn PDF document text
    • http://vapewokadovusa.myartsonline.com/enter_the_triple_bottom_line.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/medibegonoz.pdfIn PDF document text
    • http://suxorodefis.epizy.com/types_of_adverbs_in_english_grammar.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_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 5344 bytes
SHA-256: a71a98472c23dadd1e0267cc331734df8ecb94ec671291dd85a611805817e6f2
font_01_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 11596 bytes
SHA-256: 5d8b1d3a55f2c4432e24b3192c69544399720c4653326d830432baceb34609fa

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