Malicious PDF — malware analysis report

Static analysis result for SHA-256 64888e0fe1a7989e…

MALICIOUS

PDF

55.4 KB Created: 2020-10-05 03:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a48e45e49a01705a10c39222fb1c98d9 SHA-1: 147d16ac4c4b25ad9326333241306c007d3e3d3c SHA-256: 64888e0fe1a7989ef4b6961665dd08439df58e7ef7657e4b46823bf56aca48c3
124 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the same malicious URL, suggesting an attempt to trick users into clicking it. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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://cctraff.ru/strik?keyword=statistical+rethinking+a+bayesian+course+pdf In PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/11605021451.pdfIn PDF document text
    • https://site-1036621.mozfiles.com/files/1036621/zitotatapume.pdfIn PDF document text
    • https://site-1040124.mozfiles.com/files/1040124/wujerepubefele.pdfIn PDF document text
    • https://site-1038431.mozfiles.com/files/1038431/tolej.pdfIn PDF document text
    • https://site-1042014.mozfiles.com/files/1042014/sefidupelomewuxenib.pdfIn PDF document text
    • https://site-1039800.mozfiles.com/files/1039800/69862198500.pdfIn PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/82934880639.pdfIn PDF document text
    • https://site-1037011.mozfiles.com/files/1037011/31882902079.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/jazud.pdfIn PDF document text
    • http://files.bvtfacts.com/uploads/1/3/1/1/131163793/33e45f3dee7b1.pdfIn PDF document text
    • http://files.youndtexcavating.com/uploads/1/3/2/6/132695531/9474709.pdfIn PDF document text
    • http://files.durtyhussey.com/uploads/1/3/1/3/131383928/1ddcb1bc7.pdfIn PDF document text
    • http://dalexax.lifestylelanguageschool.com/uploads/1/3/2/7/132740594/3546552.pdfIn PDF document text
    • http://files.biopharm-medicine.com/uploads/1/3/1/6/131606526/0a896d.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/6d5cb845-aaef-413d-a30f-786a23a8af4e/34770329389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cf38bb-e612-428c-8458-84e8b82de733/85835750256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b059dd37-d9a4-40a4-9930-922dabcbe024/losizufutimiwurejuvige.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_off00008f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F65 5824 bytes
SHA-256: 942bb29db6bee97a26da3b99013c7e401beed0e3eceb4d5463a3af6ba2964450
font_01_sfnt_off0000a332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA332 14316 bytes
SHA-256: f5589c5542c27b88889521c4a270adea9849303927ecd7642a79bc342e46d52b

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