Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4f80bc247c8b06…

MALICIOUS

PDF

77.7 KB Created: 2021-03-22 13:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 83509efceeb9ff699ec27c982f5bd3de SHA-1: 29d672d28234b59a9ec780dfc1d13567c3946d7c SHA-256: ca4f80bc247c8b064df2a152d319c2cbc737756b41bd8d233729894b67f33ebc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=how+to+become+a+foster+parent+in+connecticut PDF link annotation
    • https://guxatizozekeme.weebly.com/uploads/1/3/4/7/134733227/6640676.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/jxjKia7/pew_pew_waves_in_spaceships.pdfIn PDF document text
    • https://finaxapiw.weebly.com/uploads/1/3/5/3/135301963/tosanireno-butakewi-zepemibupaji-kejedipabatit.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/vaigieT/skiddy_car_online.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/online_editor_add_page_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/fwB2hji/92476590715.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/dirudoramelovapozala.pdfIn PDF document text
    • https://riganekonima.weebly.com/uploads/1/3/0/8/130874133/diwok.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/popuwejit_xavedelakep_dibugeke_kilutogojunatu.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/el_par_biomagntico_dr_isaac_goiz_duran.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/sarareraxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_56d3fb51a36d45fd939ac5753b752833.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_00d73aea7d014472b8a1eb443dabef3b.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_b762852d3ceb4c51a023fbefa8fef217.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_115e432599794b41a63ebd30dd10eb9c.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_324cef7e41be476e86b5d8f617faaf97.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_8c3af44ee7274e6294ed38bb3d2b48bc.pdf?index=trueIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_6dedc4358090495da62ce0697f0559ed.pdf?index=trueIn PDF document text
    • http://favuzokusom.rf.gd/solving_absolute_value_equations_algebra_2_worksheet.pdfIn PDF document text
    • http://jotudokizer.onlinewebshop.net/chest_guidelines_2020.pdfIn PDF document text
    • http://dupizorof.rf.gd/jonabefe.pdfIn PDF document text
    • http://dopatujijidami.epizy.com/57158906695.pdfIn PDF document text
    • http://gevewodex.epizy.com/card_creator_program_free.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_977b9103e9844d77a115271c75fc83cd.pdf?index=trueIn 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_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 5320 bytes
SHA-256: fc9e7110cd2b4713b64990da08074656cfc79ef5cf260d7d7e3cd43c5360506d
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 10916 bytes
SHA-256: 1eba038c4aa236b6e509e58c6e95c6eb8ea2b51e98e419223eb35a0040952ec1

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