Malicious PDF — malware analysis report

Static analysis result for SHA-256 659b98156e89be6d…

MALICIOUS

PDF

74.9 KB Created: 2021-01-02 14:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2ed9f93cdeaf58ac10729d894c2cba9c SHA-1: f7b5befa729915e7b29012d0a027d2925db9a176 SHA-256: 659b98156e89be6d61cb609f9e452ef2bb8980204e7e741901eb4693f9b4019e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/aws?utm_term=guided+meditation+scripts+for+anxiety In PDF document text
    • https://libufuvebugun.weebly.com/uploads/1/3/1/4/131406816/konajitenebigake.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5fdfa19eda4d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5fe36d1052b0b.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/reruzexobukitipom.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/I6tgeia/piano_with_pad_band_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/W0Vfj9n/71035508997.pdfIn PDF document text
    • https://marejeloxivel.weebly.com/uploads/1/3/4/7/134709382/4131065.pdfIn PDF document text
    • https://nejajabowiwuxo.weebly.com/uploads/1/3/0/7/130775705/wiwipigokalip.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/8989366.pdfIn PDF document text
    • https://subulutug.weebly.com/uploads/1/3/4/3/134349811/94e3bd01b2b5c8b.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/1141692.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/8b95fdc3-f598-4635-a7cc-7a0ae7ca6ad7/29175251329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1d3d41-3eca-480c-a82d-14bd86713dcc/pamidesevowiten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c7935e-f353-440a-8aa9-1b4718671575/solijibekepogofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9207635a-8aaf-4a09-ae05-5235e75349ba/81164320647.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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 5472 bytes
SHA-256: bfac3a22a2cc7aece5d65d17ccf3cda8b03c58125b7e1df105bce2cdc8f9da7c
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 10708 bytes
SHA-256: b129dc4429fc39c9a25a0182468132f543661862ec027d88c4b77f59c3e47dad

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