Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb19521dc4e1415…

MALICIOUS

PDF

38.7 KB Created: 2020-11-09 16:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba09f4be2ba3cdfff1ce74a027ad4f06 SHA-1: b366154acddf2a72597aa430ce6aed73e91270e0 SHA-256: 9eb19521dc4e1415d77bcb9035bc2025dad54a29ec08eee15bb869f3a98be726
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains URLs that appear to be lures for study guides, likely intended to trick users into navigating to malicious sites. The ML classifier strongly indicates maliciousness, and the presence of numerous embedded URLs supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafficel.ru/aws?keyword=elementary+quiz+bowl+study+guides
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/limumijuvapotal.pdf
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5f994e4083129.pdf
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/8930628.pdf
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/jodujaxazusa_vomomanebatanix_xalebudegafugug_pevufewi.pdf
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/soxojajenup.pdf
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/motojewakax.pdf
    • https://cdn-cms.f-static.net/uploads/4453333/normal_5f9fba6ca92a3.pdf
    • https://cdn-cms.f-static.net/uploads/4481158/normal_5fa8afb931922.pdf
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5f8f733b8bb75.pdf
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5f93ef5995f39.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/da056c34-fb10-4725-83ba-9330b7833398/clicker_heroes_gilding_guide.pdf
    • https://s3.amazonaws.com/damerirazib/rational_function_equation_example.pdf
    • https://uploads.strikinglycdn.com/files/002506f3-696e-460f-95da-8eb50f17f41a/lulemetisevo.pdf
    • https://s3.amazonaws.com/vigevot/nuwokomumarekapuvafoxas.pdf
    • https://uploads.strikinglycdn.com/files/2f0a541c-f0fd-45d3-a82a-26a30b169b34/fatomaporasijovades.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_off000055c8.bin
4487267e324f66e711481f120f8ac58af1dcbdfb342e29c1c1bdea7add9bc991
pdf-font-stream PDF embedded font (sfnt) at offset 0x55C8 5612 bytes
font_01_sfnt_off000068dc.bin
d13f8583c701adef2ae035084ae12464c6fc37636d80ad9fcf4116a8c8e9dc77
pdf-font-stream PDF embedded font (sfnt) at offset 0x68DC 10872 bytes