Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdec316f86836a6f…

MALICIOUS

PDF

72.5 KB Created: 2021-01-26 13:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 394ac1b8f1461538fb5f1bbe1b5e4905 SHA-1: 9e75a0241084b17da4d0079e9655f71431c38770 SHA-256: fdec316f86836a6f17e1dbb852f3a6384ff1a20f2a7d517c441743197b6c3379
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are used in a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://jacksth.ru/123?utm_term=el+poder+de+la+palabra+hablada+libro PDF link annotation
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/rizorid.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/KhfiiHT/99460386293.pdfIn PDF document text
    • https://vetenejoxo.weebly.com/uploads/1/3/1/3/131379321/rizon.pdfIn PDF document text
    • http://volosaty100.xyz/bubble_poke_breakerfnjd2.pdfIn PDF document text
    • http://rukozhop-guide.com/balemufirotolatixutiny17j4.pdfIn PDF document text
    • https://tubemugipowiw.weebly.com/uploads/1/3/4/3/134345788/6457628.pdfIn PDF document text
    • http://rewita.fun/download_knife_hit_mod_apk_unlocked_all_knife99jop.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/ddljagh/46775008974.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/steamer_basket_how_to_use18ptz.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/taxuwaluzo_dijafo_gasepuvojakufav.pdfIn PDF document text
    • http://runaxok.iblogger.org/water_pollution_in_tamil_language.pdfIn PDF document text
    • http://slamelina.website/puboxexotoxumuzosowezijalpy0v.pdfIn PDF document text
    • http://tedewirivotu.iblogger.org/beautiful_full_hd_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/puruwedisuma/ihbhfha/679745963.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/dKjdhe4/58383679393.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memaded.epizy.com/sales_forecasting_and_budgeting.pdfIn PDF document text
    • http://vatapusaf.rf.gd/64117759476.pdfIn PDF document text
    • http://zesivigodexewig.epizy.com/turetarutunoja.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_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 4964 bytes
SHA-256: e7368b57d4e1b1c25d930e08b1533ae6c214ccb4a29e5fad548d02c4650087aa
font_01_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 11632 bytes
SHA-256: 7b6bc579b0f0d1b3064ca708842217bae319d447a5aedeb7c0018bf2f09c3e60

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