Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fca218933c6d139…

MALICIOUS

PDF

78.0 KB Created: 2021-02-17 07:00:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 74751de38f05d5a481ecdb426f39f993 SHA-1: 2aa84e84e0e248c0992c8cae59016a836404f355 SHA-256: 9fca218933c6d13913ac248e3e6ae2ccd0e943ed419ef3c4a913554adb8aa6d3
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, preventing a clear understanding of its direct purpose beyond hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://crophysi.ru/wix?keyword=epcc+utep+transfer+guide+civil+engineering In PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/3012546.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/hhieihI/zipavafisa.pdfIn PDF document text
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/7513281.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/gLb1rBQ/63733834275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371508/normal_5fc5ed7eed2dd.pdfIn PDF document text
    • http://chebsvet.ru/epidemiologia_clnica_elementos_essenciais4zcwa.pdfIn PDF document text
    • https://wixepivod.weebly.com/uploads/1/3/0/7/130775856/dovasip-davulepusi.pdfIn PDF document text
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/zoveduziwutazaz.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/wewunu.pdfIn PDF document text
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/9ad26946c4c.pdfIn PDF document text
    • http://formblckr1.xyz/100_reasons_to_stay_alive_list2xdxm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_6020b6e270fa9.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/jasipixugov.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/dgdPibO/battlepillars_multiplayer_pvp.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 5340 bytes
SHA-256: fc56013de5be6b1da610b275156b7d42887ae56d73dbc12f8d680a1c5f5a4e9b
font_01_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 10232 bytes
SHA-256: 73cebdd121fa903464c29f345a1cfe531b6c80fb66e4e976aa2b2cfc653f0d9f

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