Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17e91db780f526a…

MALICIOUS

PDF

66.2 KB Created: 2021-01-17 11:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 00ca166591545d4a277b80cd092c21b0 SHA-1: 760771c77dd346d39e498e91197f9b32a42f2ab9 SHA-256: e17e91db780f526a801a711845ded74b67c0327644143d90e880fb2aff5586f6
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate it's a link farm designed to direct users to disposable hosting, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious sites, aligning with phishing or credential harvesting tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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/123?utm_term=4+pics+1+word+answers+pdf+projector In PDF document text
    • https://cdn.sqhk.co/bitaxukezor/idpBiec/minerva_mcgonagall_cat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_5fb8948f452b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_5fae9ac499719.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/qLuigNs/48783306128.pdfIn PDF document text
    • http://jolujunutido.iblogger.org/gogukovobem.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/hhAhchc/smith_s_grocery_hours_las_vegas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489032/normal_5fb32b548e96d.pdfIn PDF document text
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/vegubiwovuz.pdfIn PDF document text
    • http://miworusak.iblogger.org/guitar_amplifier_software_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bivadudit/jnidhb1/assistant_director_jobs_los_angeles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f9078cb28a82.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/3Cjb0ii/noromosorozivigokukaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipinasin.epizy.com/34643845289.pdfIn PDF document text
    • http://nezopodadas.epizy.com/16411613417.pdfIn PDF document text
    • http://melumudinev.epizy.com/gexitaxojitadavovo.pdfIn PDF document text
    • http://bapexuzajo.epizy.com/material_design_admin_template_react.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_off0000c651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC651 5332 bytes
SHA-256: b0869fa4885605fdbba66602b47c114d84db6121fe90b2f6bf29c5fee02a918e
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 10376 bytes
SHA-256: 778209d5a896c94d52740d4c1f151d037cfd43bea1650193174e4f28c6f0724e

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