Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77331c5261da4ea…

MALICIOUS

PDF

87.9 KB Created: 2021-04-21 15:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cfa0ac6c77af8931369285478de327bf SHA-1: 2015ef496bf62d2a5e5ad1572cbd289eaa2eee9e SHA-256: d77331c5261da4ea909b3bfa78698d636fea282fe8a7c34471e8eb60757c8b6e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://seumenha.ru/strik?utm_term=algorithmic+trading+software+python PDF link annotation
    • http://xofebuledat.scienceontheweb.net/bare_metal_programming_in_c.pdfIn PDF document text
    • http://filfex.ru/22950538276rxs8v.pdfIn PDF document text
    • http://tipines.iblogger.org/chase_sapphire_preferred_benefits.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/cannibale_didier_daeninckx.pdfIn PDF document text
    • http://parrrtner.xyz/download_baby_boss_full_movie_in_hinbq3xr.pdfIn PDF document text
    • http://zudepogumo.medianewsonline.com/mtd_rear_tine_tiller_for_sale.pdfIn PDF document text
    • http://upsbox.ru/how_many_carbs_in_taco_bell_chicken_power_bowlg01ge.pdfIn PDF document text
    • http://zivasajotafu.iblogger.org/45900140431.pdfIn PDF document text
    • http://pukazabix.22web.org/refractive_index_background_information.pdfIn PDF document text
    • http://pekibexuvipeve.scienceontheweb.net/kigobuladomejoratideladaz.pdfIn PDF document text
    • http://sumapewub.getenjoyment.net/63234459413.pdfIn PDF document text
    • http://pisozuzata.iblogger.org/30902103424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gowamatul.epizy.com/autocad_practice_drawing_exercises.pdfIn PDF document text
    • http://najepesirezamuz.rf.gd/eraser_full_movie_in_tamil.pdfIn PDF document text
    • http://fuvituze.epizy.com/fractions_worksheets_5th_grade.pdfIn PDF document text
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_96eca0cfc57244acaa9dadba55486cd7.pdf?index=trueIn PDF document text
    • http://sazosubegus.epizy.com/wimuzelorafilimuru.pdfIn PDF document text
    • http://pikasimowojinub.epizy.com/waec_chief_examiners_report_2018_bece.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_d8c528b54a684c558cf7005226c807e1.pdf?index=trueIn PDF document text
    • http://kunasajijujaf.rf.gd/gomudizuruvasozerof.pdfIn PDF document text
    • http://bafoseniza.rf.gd/similarities_between_descriptive_and_inferential_statistics.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_e41683b6ee9f4866b0eeb114c060bdfd.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_46f2c171907b480a800965358fd1dd85.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 5752 bytes
SHA-256: 3a0a230239c3bdf2d6d62f184682a97312b1d2c39b68b98099e0b3bae35ee49e
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 5908 bytes
SHA-256: 4d071a020401e1323f50bad7619b21af69761875698314f0c03e3548799d98dc
font_02_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 11884 bytes
SHA-256: 1b9d35517335f6e2f5dac37eddf7cf82beac77058faad43287bb09685274f0f4
font_03_sfnt_off00013a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A32 16852 bytes
SHA-256: 398d0293f07f01909986490cc80f99f666f5a84bae3c434fb650dba2a879b9c6