Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9b063c9d22a010…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 21:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 19dd579d3df121e5cf3f4ec537de04af SHA-1: 39233f3c359c00dcd104e8cfbd87c5ddd2c9c293 SHA-256: df9b063c9d22a010e02e3ab9d3b3d1ca7fe88a2b050743293477e447f2eb4df3
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, several of which point to suspicious domains like 'nipisod.ru' and 'kersita.fun', suggesting a phishing or malware distribution attempt. The PDF structure itself is also flagged for being a link farm on disposable hosting, further indicating malicious intent.

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://nipisod.ru/award?keyword=architecting+data+lakes+pdf PDF link annotation
    • http://kersita.fun/kitty_daily_activities_gamessn7j0.pdfIn PDF document text
    • http://doctorzlo.com/french_vocab_word_searchvlr8p.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/91090895973.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/ejdFsgf/datipelobigekipo.pdfIn PDF document text
    • https://cdn.sqhk.co/vakujediraw/d4ogf4C/unscramble_words_cheat_uk.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/miss_peregrine_books_genre.pdfIn PDF document text
    • http://beremoter.online/yuk_belajar_saham6fmdi.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/bhijKHJ/disorderly_conduct_ohio_board_of_nursing.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/math_worksheets_for_preschool_free_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/oThcfhg/volixujepujivof.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/jusagi/todowuruginawigapavat.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_2c10cbc176194ce5bf2dbdc3ec0caa62.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_315f811a9af04720b1c36201f3f42c4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/besafefaf/12582272233.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/16263365195.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/57948485799.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_181971955b7945cc8fb424a1b14fe4da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/34638612172.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_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 5468 bytes
SHA-256: 37c633e0239b59920e80c4fd2c1c40eaf692f97c35d3d7b821eac31fa088ac3b
font_01_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 10984 bytes
SHA-256: 438ffa56d2398f035a64854931e1f65a81599f77764ccf37fb8bb931ea72e0db

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