Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90b4bf8c6b9f975…

MALICIOUS

PDF

69.6 KB Created: 2020-12-27 14:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cf2d2ac95dc767fb16aaf0915455afd0 SHA-1: 773952d005c4038a2889994eed44b32428601df2 SHA-256: a90b4bf8c6b9f9757ff64f3587791d9d0cd607932e2a5d7f5abf70522af6fe1b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically leading to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily garbled, contains text related to 'Cinema box app download for iphone', suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=cinema+box+app+download+for+iphone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5fb253722f451.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/dotunakamonuv.pdfIn PDF document text
    • https://disesusobabetom.weebly.com/uploads/1/3/0/8/130814900/9906153.pdfIn PDF document text
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/9101509.pdfIn PDF document text
    • https://lariwajiko.weebly.com/uploads/1/3/4/3/134316624/vedolelatisovo-monifenavagaj-tovijo.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/kadisekafelowapoj.pdfIn PDF document text
    • https://fixubosadad.weebly.com/uploads/1/3/4/6/134658154/03d5c907bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4620350-5e17-4e19-9bc4-afa762b7d33f/94916358936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2525aa2-d5b5-43b3-a2e2-0d932d568436/naval_ceremonies_customs_and_traditions.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/boss_movie_moviescounter.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_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 5308 bytes
SHA-256: e5fbf29d8e037ed3d61cdc7253b953e2fa916bce49a1982cd254a79dd95e4cc9
font_01_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 10696 bytes
SHA-256: 65e0c38b76fa747b7cd212ab33077b3a99e58146840cdfff5b864555ef79c9d7

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