Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c433ad229782a4e…

MALICIOUS

PDF

72.9 KB Created: 2021-04-20 17:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 491603a06689c4446e3565e48ccca1a1 SHA-1: 5c082345ff2d1bbdb98e2e82755b3f60b5252222 SHA-256: 8c433ad229782a4e0e80f145ac57ff36758dc1b96c1841d5e29a7008d8bae872
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or phishing attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a pattern of using multiple hosts for link distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely related to directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.woonsocketri.org/system/temporary/webform/makepepatamizozixijefawop.pdf In PDF document text
    • https://www.blplegal.com/sites/default/files/webform/pifijolaj.pdfIn PDF document text
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/35757612566.pdfIn PDF document text
    • https://aboss.by/sites/default/files/webform/tatesejozamelifat.pdfIn PDF document text
    • http://russian-ice-spb.ru/sites/default/files/webform/files/40307308503.pdfIn PDF document text
    • http://seiary.com/sites/default/files/webform/rec/netugapufuzutazegiwiwivi.pdfIn PDF document text
    • https://www.visitsavannah.com/sites/default/files/webform/59391310887.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
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bissell+spotclean+proheat+pet+portable+carpet+cleaner+manualPDF link annotation
    • https://www.vub.be/sites/vub/files/webform/43319512550.pdfIn PDF document text
    • https://www.vub.be/sites/vub/files/webform/gegisikirusesikogibo.pdfIn PDF document text
    • https://community.princeton.edu/system/files/webform/4167827641.pdfIn PDF document text
    • https://drones.princeton.edu/system/files/webform/94207829768.pdfIn PDF document text
    • https://campusrec.princeton.edu/system/files/webform/wawojamifot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC5 5244 bytes
SHA-256: e95ba661f23ce110fc60bd194b50edd62859d03dcab55a00c0e27184fe94ab69
font_01_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 10768 bytes
SHA-256: a400989beacaabda39c560e21ef0d38154bb4664d46a980aa830c27841965db7
font_02_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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