Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72ec416248770b1…

MALICIOUS

PDF

83.8 KB Created: 2021-03-31 20:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 08c403140e4f614608f49c4e22c23ecc SHA-1: ab068dfbc88fabdcc7a019694448a57fd89965af SHA-256: d72ec416248770b1378c2e9ebcd8edd441345580f8fe13af5716f03bf8f624d0
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on disposable domains. The presence of embedded URLs and the PDF structure suggest it's designed to exploit users by redirecting them to potentially harmful sites.

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://midufefew.ru/award?keyword=pengertian+desain+grafis+pdf PDF link annotation
    • http://hayatevesigar.online/how_to_change_premiere_pro_resolution1mrpw.pdfIn PDF document text
    • https://cdn.sqhk.co/givikufat/heqEjqQ/toon_blast_cheats_iphone_no_survey.pdfIn PDF document text
    • http://getcreditcheck.info/the_royal_ranger_duel_at_araluenre5c7.pdfIn PDF document text
    • http://cardioactiveuficiale.site/16405948453f63g9.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/54810614697znn3n.pdfIn PDF document text
    • http://honey-love.ru/hp_officejet_pro_8600_printer_setupijnn6.pdfIn PDF document text
    • https://cdn.sqhk.co/pawexedibib/didjf7o/kipigivuxafagokekam.pdfIn PDF document text
    • http://cosmeteca.com/pit_bike_motorcycles_for_sale98nd9.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/dje9idu/facebook_analytics_api.pdfIn PDF document text
    • http://daating19.site/new_bengali_song_2019_videoddml0.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/8000231349.pdfIn PDF document text
    • http://rewokujow.scienceontheweb.net/kadambari_file.pdfIn PDF document text
    • http://natikolom.site/kobekigadaveravoxafern8zd.pdfIn PDF document text
    • http://meetsoda.club/nelubarivinalawigevrjqo3.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/cellulose_microfibrils.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/piliwixamadigubsxebj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujekodade.epizy.com/muwun.pdfIn PDF document text
    • http://temodorofeg.atwebpages.com/capricho_arabe.pdfIn PDF document text
    • http://pobevejilu.rf.gd/why_does_my_kidde_smoke_alarm_go_off_for_no_reason.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_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 5176 bytes
SHA-256: fe0337e86a52064adff8c2f21417b81c15ee7f8e0abd08524ef2af925e29a070
font_01_sfnt_off00011cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 10840 bytes
SHA-256: ae78d8ec1beda05d1069693a25f78b11613eb61339b2b816b8e1dd4a94234976

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