Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddcb024f6ee8340…

MALICIOUS

PDF

89.0 KB Created: 2021-05-09 17:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cb2afce81e0548ee6b576518ad28c23a SHA-1: 54ecea886cdb80f39ca085c79a8109e0f694148a SHA-256: 4ddcb024f6ee8340a27648398f7c15ff94f9bcecc06fcc03633210e6a0e926b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

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/strik?utm_term=initialize+array+structured+text PDF link annotation
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/6976315.pdfIn PDF document text
    • https://wepusetu.weebly.com/uploads/1/3/2/6/132695333/1942900.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/69184901020.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/46646640029.pdfIn PDF document text
    • http://torezalikoli.22web.org/sibuf.pdfIn PDF document text
    • http://vofitoweba.22web.org/explain_accounting_concepts.pdfIn PDF document text
    • http://risizotifapeju.iblogger.org/how_to_describe_a_logo_for_trademark.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xibiwoziveva.epizy.com/what_is_ts_16949_in_hindi.pdfIn PDF document text
    • http://livivisobozi.rf.gd/when_you_love_someone_lyrics_youtube.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_6e9f86c110a241c0827f684a32652cdf.pdf?index=trueIn PDF document text
    • http://likumukifaxokoz.rf.gd/que_funcion_cumple_el_asesor_educativo.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_6ad0f3cc786942cbb6e68a36d63b570c.pdf?index=trueIn PDF document text
    • http://bopenakonaj.rf.gd/cosmoline_sds_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5436ca01-6bf2-4a60-8f58-f5f4ea6dda26/how_to_make_a_half_joint_woodworking.pdfIn PDF document text
    • http://litopuputorer.rf.gd/jasamivamazawafupanov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5c7b78-7954-4984-a8d2-0f5eb1dadd5c/69681085170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61987a1-0ef6-41d8-a8d5-af789bb4db3c/dalaz.pdfIn PDF document text
    • http://fabibobitobabo.epizy.com/26928311217.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_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 5088 bytes
SHA-256: f635e51d8713191ede0b6256a78a92691373e3038c83571f30ea7e505ea1dbf0
font_01_sfnt_off00012ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE9 12332 bytes
SHA-256: 9c7ec8387be7643f78a9cee38273c266f4a89d02cb4b487fed7a050bc52b3ba1

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