Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4ce18bfcfe90fe…

MALICIOUS

PDF

72.7 KB Created: 2021-01-24 06:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 74985ed429200850e09cbad6a6143262 SHA-1: 67683c9b0da1c1eab50218dcc257e29efef4dafb SHA-256: 3d4ce18bfcfe90fe21fb127f6ded4c98eaa39a69e142e2f66e0e5d015c51fe51
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to external PDF documents hosted on various disposable domains. The heuristic firings indicate it is a malicious redirector and a link farm, likely intended for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/wb?keyword=coreldraw%20keyboard%20shortcut%20keys%20pdf In PDF document text
    • https://site-1168192.mozfiles.com/files/1168192/vibekik.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/3b8c0.pdfIn PDF document text
    • https://site-1174448.mozfiles.com/files/1174448/29974107798.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/k8bhgrg/37088966419.pdfIn PDF document text
    • https://site-1168501.mozfiles.com/files/1168501/paripatas.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/pezerem.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/hbvXgek/talking_angela_hacker_kidnapping.pdfIn PDF document text
    • https://cdn.sqhk.co/tevitogaperu/1ibjfkf/angry_birds_transformers_hack_version_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409403/normal_5ff14a8a9e9a6.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/Nhghdv2/20906273298.pdfIn PDF document text
    • https://site-1179585.mozfiles.com/files/1179585/clash_of_clans_private_server_ios_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/gHHqgig/kowekoresezapadezuvazawan.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/gdgfigl/33183010276.pdfIn PDF document text
    • https://site-1177275.mozfiles.com/files/1177275/90943730358.pdfIn PDF document text
    • https://kozewofedira.weebly.com/uploads/1/3/4/8/134899359/6565580.pdfIn PDF document text
    • https://site-1200115.mozfiles.com/files/1200115/somavofi.pdfIn PDF document text
    • https://nasovakuj.weebly.com/uploads/1/3/2/3/132303133/matumizajubeza.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_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 5548 bytes
SHA-256: e9e9eed12a5281abe28b6d5d0f50fd914a034d0d63d0df1330e19aad27973383
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10700 bytes
SHA-256: 6a991ff685c3e17fc9c669c352243526cca2c78803657eb2ce3d44dfec5cc91b

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