Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ba830309d36527…

MALICIOUS

PDF

80.5 KB Created: 2021-04-07 12:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 050589c1873c795f98bb8a148d30db9c SHA-1: cc867bebd42f8b21f8369a859014080169e8a0f1 SHA-256: 66ba830309d36527de356423a9005204d155163431794de9394b871ec3e33a08
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://nipisod.ru/aws?utm_term=97+polaris+xplorer+400+performance+parts PDF link annotation
    • http://gelupulofevabek.medianewsonline.com/1632328337.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/4oLidLk/xaxixebuwu.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/mathematics_question_papers_grade_12.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/bulodomatori.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/ie73jfJ/new_york_times_newspaper_owner.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/80056459636.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/avery_label_templates_5163.pdfIn PDF document text
    • http://dunetetemob.22web.org/26960785221.pdfIn PDF document text
    • https://cdn.sqhk.co/penuputasa/rifknXa/gb_whatsapp_2019_app_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ximawefab.epizy.com/classical_guitar_music_sheet.pdfIn PDF document text
    • http://koxaxoboxuzir.epizy.com/kibilozeli.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/cctv_camera_system_configuration.pdfIn PDF document text
    • http://situwosase.myartsonline.com/political_map_of_africa_blank.pdfIn PDF document text
    • http://wofavum.myartsonline.com/annotated_bibliography_guidelines.pdfIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/byte_stream_to_c.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/50260945984.pdfIn PDF document text
    • http://desejole.myartsonline.com/lulujopinavuxipela.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 5388 bytes
SHA-256: 96201de92777717f4f2032dd93315c1f743bad5fac544da9aab6bae5a050bb96
font_01_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 11924 bytes
SHA-256: fb9baa8623589f8f4281ff2e7505af4e18e256e7d5e0b7dd55bc99c01801001c
font_02_sfnt_off000124eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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