Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb96859f5d5785e5…

MALICIOUS

PDF

75.0 KB Created: 2021-03-19 23:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0611054ebc04c80931b6f4a1baed34e6 SHA-1: 444e0829f2cce6053d2a13266f28b547dcc3c79a SHA-256: fb96859f5d5785e52ed0345b07a549814628c6c90cfbf4f1c9329f55ba973f9b
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are obfuscated or lead to potentially malicious sites, indicating a link farm or SEO manipulation tactic. The presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

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://jacksth.ru/wix?keyword=last+shelter+survival+mod+apk+unlimited+diamond
    • https://tetalopen.weebly.com/uploads/1/3/1/8/131857308/bafevojig.pdf
    • http://zifixoribe.scienceontheweb.net/tobewuzo.pdf
    • https://static.s123-cdn-static.com/uploads/4454559/normal_5ff6727cdd6aa.pdf
    • https://cdn.sqhk.co/zopezepazedo/gcibgvq/beats_x_quality_issues.pdf
    • http://lafilubepojev.scienceontheweb.net/68518504410.pdf
    • https://cdn-cms.f-static.net/uploads/4389074/normal_60531afb9bf7b.pdf
    • https://vofaxarexokuj.weebly.com/uploads/1/3/4/7/134762848/69de5db2eb09730.pdf
    • https://cdn-cms.f-static.net/uploads/4401972/normal_602c7613c2fc1.pdf
    • https://cdn-cms.f-static.net/uploads/4450636/normal_604e6393175ea.pdf
    • https://cdn.sqhk.co/fuwufupi/0OHhjuk/65593272027.pdf
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/99689fa0e20035.pdf
    • https://cdn.sqhk.co/lokabawopup/rjhhfhf/27299124510.pdf
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6030263b97500.pdf
    • https://cdn-cms.f-static.net/uploads/4367622/normal_6027a7d03e103.pdf
    • https://cdn-cms.f-static.net/uploads/4393785/normal_60357c3687ab9.pdf
    • https://cdn.sqhk.co/dixufeja/daShcjb/buwibamumebiletuda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_6c040325b9ee40fb9e150536fcaca508.pdf?index=true
    • http://lamupimifuban.onlinewebshop.net/sageg.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_2874248e15a3431e9e66ac81584ba20e.pdf?index=true
    • 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_off0000e651.bin
0e8495a81dff742359917f958c4ddacc338479f4726d26c90c6faed2c302e7e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 5264 bytes
font_01_sfnt_off0000f817.bin
aa34e6d3230b8f9e615d799b08fabcd4d620f1c529a8ed61a3657c6bc0df5860
pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 10880 bytes