Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca64925035bf0d5…

MALICIOUS

PDF

84.2 KB Created: 2021-02-24 13:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7f624cb783157ce52c66694e1bc367e9 SHA-1: 9d54a684e8ff718f117878a495a8068f4db5d683 SHA-256: 4ca64925035bf0d5377506edf6c90ba2ed7b19be434b088165b19fe4c29a9df3
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a book title, combined with authoring application details. The presence of password protection instructions suggests a multi-stage attack, likely involving an encrypted payload. The ML classifier strongly flags this PDF as malicious.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crophysi.ru/wix?keyword=bridge+to+terabithia+pdf+book In PDF document text
    • https://delosixopefo.weebly.com/uploads/1/3/4/3/134344482/dosuwatadonavowo.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/wutosazimavu.pdfIn PDF document text
    • http://affilateapp.online/dark_angels_3rd_edition_codex54pdp.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/Y0Mhg6g/77647372565.pdfIn PDF document text
    • http://romeoplanet.club/how_to_use_timex_indiglo_thermometerbptnq.pdfIn PDF document text
    • http://ledimpress.biz/cant_change_channels_with_samsung_remotejbpxa.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/jeruvavuzezod.pdfIn PDF document text
    • http://copytoshka.ru/jituvipowaxodv2e1q.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/kipuk.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/iijjGij/93959792223.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilogifuxe/ggcnfO4/95778121666.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jijari/kizazuguba.pdfIn PDF document text
    • http://vusukunuvedigup.epizy.com/42853287110.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/kadnlarn_beden_dili.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/75416169945.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_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 5344 bytes
SHA-256: 74c70492eedb766ee182b3329ed80e501eda3902a59a1948f378ef71507f0c29
font_01_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 11212 bytes
SHA-256: 5e87c5c92e0b587c5d8c6e37e2f0793e38711f9e8634a14461c6f92c12108f74

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