Malicious PDF — malware analysis report

Static analysis result for SHA-256 d593d1c62096804e…

MALICIOUS

PDF

80.2 KB Created: 2021-02-21 21:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 088a143c43c74bb6266842653c79dd74 SHA-1: b26757dece7e1e02ea86fc13125c58dc7ed3c739 SHA-256: d593d1c62096804eb47d0e51d8670f7e8343283016217dd578fde67958701fa9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to a link farm strategy, with numerous external links embedded within the document, including a suspicious URL related to 'short moral stories in english pdf'. The document body, though heavily obfuscated, appears to be a lure to encourage users to interact with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/123?utm_term=short+moral+stories+in+english+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424361/normal_5fe8ea49935bf.pdfIn PDF document text
    • http://prodson.space/balance_of_payment_concepty9r7c.pdfIn PDF document text
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/lunaduparamudukelos.pdfIn PDF document text
    • http://dazixetenulega.22web.org/66041463218.pdfIn PDF document text
    • http://ygrash.website/physics_ncert_solutions_class_9gxfbc.pdfIn PDF document text
    • http://qwertyujg.xyz/32186465256hrqk4.pdfIn PDF document text
    • http://texulateniz.iblogger.org/magolimenarikezudad.pdfIn PDF document text
    • https://sudikefasegez.weebly.com/uploads/1/3/1/0/131070357/fumawakejilubonegimo.pdfIn PDF document text
    • https://xefapakofaguwa.weebly.com/uploads/1/3/1/1/131164324/vidoxatavile-saluj-wurexalutasama.pdfIn PDF document text
    • https://wanevowak.weebly.com/uploads/1/3/4/4/134465130/f6229152.pdfIn PDF document text
    • http://steelsho3.club/xetusivofivifijexaeqlmk.pdfIn PDF document text
    • http://pixell.store/48486578044tlqh2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ximupuv/wutusitufag.pdfIn PDF document text
    • http://sefatefa.epizy.com/betudomefalifol.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/classic_rpg_games_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/where_is_the_wps_button_on_my_netgear_router_7550.pdfIn PDF document text
    • http://dojopugoput.epizy.com/letter_e_sound_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/2019_calendar_template_docx.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/punnett_square_dihybrid_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/rascals_movie_all_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/toro_ecx_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/bumblebee_transformer_costume_3t.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/spirit_airlines_information.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_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 5560 bytes
SHA-256: 1905520dade7b31e31239312af077bdeac56c6cc69202af0e3027e28bd2fef64
font_01_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 10684 bytes
SHA-256: 55ab564084c71d01d1705ce3451f014a32217157295d7cc83867faa468bab0a5

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