Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d27ea0e07872ba0…

MALICIOUS

PDF

35.8 KB Created: 2020-10-05 12:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76914211f0f9e94aaedd32b7a5900755 SHA-1: 52210b00d9477990716ffea14d9939ed60f6d4b0 SHA-256: 1d27ea0e07872ba0869f4c4660c96a735a6c5a18e312dddbe959684c217d2090
124 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, including one that points to a known malicious redirector. The document body text, while partially corrupted, includes the phrase 'Agenda docente 2020 pdf gratis chile' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=agenda+docente+2020+pdf+gratis+chile In PDF document text
    • http://files.truecolorscoach.com/uploads/1/3/1/4/131406698/7597103.pdfIn PDF document text
    • http://namid.aera20.net/uploads/1/3/1/4/131437130/7349107.pdfIn PDF document text
    • http://files.bookyouraudition.com/uploads/1/3/1/3/131398177/fowele-fivoba.pdfIn PDF document text
    • http://nuligug.springer-acehomes.com/uploads/1/3/0/7/130740178/8911156.pdfIn PDF document text
    • http://mawemudun.josephbmccaffrey.com/uploads/1/3/0/7/130738526/xusivexo.pdfIn PDF document text
    • https://site-1043571.mozfiles.com/files/1043571/jowuxogotaj.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/61530482943.pdfIn PDF document text
    • https://site-1038794.mozfiles.com/files/1038794/vudemazazebotugusosobige.pdfIn PDF document text
    • https://site-1036885.mozfiles.com/files/1036885/65782796325.pdfIn PDF document text
    • https://site-1040000.mozfiles.com/files/1040000/fidomipagefiluzububusib.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/noxidavofajetakupize.pdfIn PDF document text
    • https://site-1039494.mozfiles.com/files/1039494/saril.pdfIn PDF document text
    • https://site-1036995.mozfiles.com/files/1036995/mepafotegotepe.pdfIn PDF document text
    • https://site-1040800.mozfiles.com/files/1040800/xodasupelugajorinefokofik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00004396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4396 5680 bytes
SHA-256: e87284992d4f76d06c19f7978c174d08af78e8abfa261d49654b340c5b9c32b5
font_01_sfnt_off000056e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56E3 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00005f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F70 10276 bytes
SHA-256: a4565b246e3a3995f6316bcb3942cb8181a393a5631d7ce370c95dd9bda38346

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