Malicious PDF — malware analysis report

Static analysis result for SHA-256 f865b66f8da6e814…

MALICIOUS

PDF

46.1 KB Created: 2020-10-03 13:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d6bc33e73e3cf2a98de54a1aaa23981 SHA-1: 7560f3bf87a564e47003c061d4b49e881184884b SHA-256: f865b66f8da6e814bd412a3a7a9d8c7f911f3506fda9bd0e59e6afe042271ba3
124 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, including one pointing to a known malicious redirector. The document body and embedded links suggest a lure to trick users into visiting malicious sites, likely for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of multiple disposable domain links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ggtraff.ru/strik?keyword=pdf+in+windows+10 In PDF document text
    • https://site-1036957.mozfiles.com/files/1036957/69254978152.pdfIn PDF document text
    • https://site-1036881.mozfiles.com/files/1036881/somuwukokiz.pdfIn PDF document text
    • https://site-1039131.mozfiles.com/files/1039131/37154580561.pdfIn PDF document text
    • https://site-1040438.mozfiles.com/files/1040438/46676985343.pdfIn PDF document text
    • https://site-1038744.mozfiles.com/files/1038744/41932170165.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/liraxofujeteji.pdfIn PDF document text
    • http://files.regencyparkcary.com/uploads/1/3/0/8/130813777/nuzawilijirez.pdfIn PDF document text
    • http://files.therapyinternational.com/uploads/1/3/1/3/131381316/2299833.pdfIn PDF document text
    • http://files.hsmcwa.org/uploads/1/3/1/6/131606890/viwomururule.pdfIn PDF document text
    • http://jotufazi.atxalive.com/uploads/1/3/1/8/131871825/8e9b7ac645f8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB8 4440 bytes
SHA-256: 773858dc05f91f2d5b9830e5fd80c02c7541e22f5cbe8a8cd66ced4d36c3cbd6
font_01_sfnt_off00007be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE4 10020 bytes
SHA-256: 1e97975cb38de1df09f7de45843103a2224095056386fc9a44c98c9f7bddedfb
font_02_sfnt_off00009e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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