Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee484c740e6891e8…

MALICIOUS

PDF

72.2 KB Created: 2021-03-02 04:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0258bb2ca4741d00894512df977bbc81 SHA-1: 9012bd93aefa33722f9c4779f14568e2ebccacc2 SHA-256: ee484c740e6891e8c38cdb975d1c70fea8818af6978b11a32aa994e6120039a1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=how+to+work+out+net+profit PDF link annotation
    • https://tifozofazok.weebly.com/uploads/1/3/1/3/131383738/f3e3d35adb66a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_600bccb324259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601914bc89455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504568/normal_6004b1ae7bead.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/xebojikujoti.pdfIn PDF document text
    • http://vepozatab.22web.org/sixowukagerupewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413008/normal_5ff21e4d1f59a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_602ff37fb270c.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/52490308327.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/e8f11fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_601fd0812166c.pdfIn PDF document text
    • http://govnosiakxws.online/5610440950rspwl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_603415e29b1f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_60121992242b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/ryobi_2000_psi_electric_pressure_washer_price.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/49520267536.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 4592 bytes
SHA-256: 117f432139ffc839f91673953f29f696fd94fd1fbbda3074b1d2bf7242c69d12
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 10732 bytes
SHA-256: 8b4aed0aa3035a505886460d069cbe77a8c24a4d34d5d3d94e76e041c7bf9313