Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2c1df7f1460903…

MALICIOUS

PDF

72.4 KB Created: 2021-04-17 17:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a392b2025ca82f7a866abf53dc89e51 SHA-1: d238f85bc6c22dfd6646ad2d13295822c82f3f96 SHA-256: 5b2c1df7f1460903f6bf815cb456ea79999e1d38e01c5f0faa4a1c8b4baa7db1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as search results, a common tactic for driving traffic to malicious sites. One of the primary URLs, https://vilenefex.ru/strik?utm_term=honeywell+thermostat+model+rth6580wf1001%252Fw, is presented as a search result for a specific thermostat model, suggesting a lure to a phishing or malware distribution page. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://vilenefex.ru/strik?utm_term=honeywell+thermostat+model+rth6580wf1001%252Fw
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/debimidozige.pdf
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/5852948.pdf
    • https://feketofemij.weebly.com/uploads/1/3/1/4/131452988/dozakasa_jadete.pdf
    • http://rabisoluvilava.iblogger.org/20143095343.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zarufutebere.epizy.com/actinobacteria_classification.pdf
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_bcc340683d9f4006a6db365e184d4879.pdf?index=true
    • http://zunebodiz.epizy.com/babul_teri_bagiya_ki_video.pdf
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_15612d8f2f33484e856c401a05e9691a.pdf?index=true
    • http://sofijorube.rf.gd/jamokimem.pdf
    • http://dewonatazuji.epizy.com/acer_da220hql_update_lollipop.pdf
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_63f77321fed144208231daec2f2f9b98.pdf?index=true
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_a2d4dfd812064834a937db0adc7447aa.pdf?index=true
    • http://wekiwuja.rf.gd/78297575657.pdf
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_e53201fa68f7409682ec50bad71cd929.pdf?index=true
    • http://petifogowiga.epizy.com/87706121628.pdf
    • http://dekifovep.epizy.com/sozixebefafi.pdf
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_ef0b5873211c4580957505ef88e0f082.pdf?index=true
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_f2c39a433143432eaa6195c791048394.pdf?index=true
    • http://kakiborul.epizy.com/breville_bov800xl_smart_oven_1800-watt_convection.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab1.bin
a77d62db9fe92c66a6ce4e4bfe362fe88e785963933935f793dc62d953c66c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 6004 bytes
font_01_sfnt_off0000ef14.bin
b2ac03389d8b33caa2876e913a7f851472cdd255419457043f527f7d00721cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 11168 bytes

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