Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e938777a7d0c1c4…

MALICIOUS

PDF

71.8 KB Created: 2021-02-15 03:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e5d4d7909694d97b1cacbbb7450221cb SHA-1: 34aca8a56aa25f034d72b0f9149aa1f2ffcdb005 SHA-256: 5e938777a7d0c1c48756020ba67f15188a65797bdae133549dccf02135a44bc4
286 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a lure, prompting the user to install a browser extension or update under the guise of needing a license key. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish for credentials. The presence of embedded JavaScript, though not fully analyzed here, likely facilitates the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://baarspo.ru/wix?keyword=license+key+hotspot+shield PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368781/normal_6010a92d3631e.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/ev5gjdz/gixunumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_5fd7b3b212733.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/lerepuveluwo.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/6902389.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanunir/fAnhhgd/titesagone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_6029a55be5349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5fd389be3558a.pdfIn PDF document text
    • https://gimepokik.weebly.com/uploads/1/3/1/6/131636980/2961882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485446/normal_5fed1e56976ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470029/normal_5fddbc58e0382.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/jDjg5ge/66749048033.pdfIn PDF document text
    • https://mavujaxubuxabo.weebly.com/uploads/1/3/0/7/130775304/xonijedepovasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvowafavij.epizy.com/18302501329.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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 4964 bytes
SHA-256: 0bf0088f5201668f04f18d4f7dafed70fbf4b2d1db402b01c850a95c366598d9
font_01_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 10704 bytes
SHA-256: 391fcdaaa6bdbfc77ae894b209cdb07a3bbe8b9fbc693a787600d2367ed444bc

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