Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d52513a703ddfb0…

MALICIOUS

PDF

78.1 KB Created: 2021-03-10 11:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6c2a69fc94f628cbb91cc418cbbe581a SHA-1: 0e934821487dcd4d1d92f18024d2cd4c9b86cdbe SHA-256: 1d52513a703ddfb0cdc403e17b30c136b7108401b6c6dd2d337fddebe7a93906
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ML classification and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site for further exploitation.

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://jacksth.ru/award?keyword=giving+directions+dialogue+pdf PDF link annotation
    • http://viwimewi.22web.org/brahmastra_maths_book_ajay_gulati_download.pdfIn PDF document text
    • https://xupodidif.weebly.com/uploads/1/3/0/7/130739682/fedejebeji_dawalun_katoveluvow_fumorekuvemu.pdfIn PDF document text
    • http://puximosuse.iblogger.org/simcity_4_system_requirements_mac.pdfIn PDF document text
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/811697.pdfIn PDF document text
    • https://kopuzivepepojom.weebly.com/uploads/1/3/4/3/134330145/naxuf_nerebav.pdfIn PDF document text
    • https://juvezunadu.weebly.com/uploads/1/3/5/3/135306862/nitasosiforat.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/fa52e5.pdfIn PDF document text
    • https://kegalanomer.weebly.com/uploads/1/3/1/8/131856310/zatuvezutekop-jawapanaripup-tonogituxiw.pdfIn PDF document text
    • https://pufoputinagof.weebly.com/uploads/1/3/4/2/134234879/6ef01.pdfIn PDF document text
    • https://vukezozonobobex.weebly.com/uploads/1/3/1/3/131383599/95e8f02f7.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/gazitif/gender_pay_gap_reporting_acas_guidance.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/gusazubitumufuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56de6946-6df2-4d55-8d50-585e181907f2/tappan_range_not_heating.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/52592590695.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/calidad_en_salud_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24f1905-2628-4b5d-8f49-b7913d4e35fb/goxasumafiwuwozeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d36d51-ad46-4b5f-8c40-cbd7b4badcb4/how_to_crochet_a_baby_blanket_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/android_adb_mac_device_not_found.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/wovujeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c184c8b1-fdc1-4609-9e1b-9ccb8e85ef4f/jimuziwejejotutu.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_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 5416 bytes
SHA-256: ddf76d4efbf46352f89bd82f3b6c3b95d75e8f77b553364d49bf5b2577188077
font_01_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 10472 bytes
SHA-256: 2459da053c0ba4355a517ad82f31e1f0bcf76108c7142d2b0462c3a70b5cc0ef

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