Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c43a09a14129c17…

MALICIOUS

PDF

67.3 KB Created: 2020-12-22 10:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 38c280e99f7081d9fe15e3d7bfb5d03a SHA-1: e01d2dc15bd60c328ecdce85887ec0e1785db09c SHA-256: 3c43a09a14129c171a90e6378a4d8baccc5d0439beefe857bceb4f8177fc931f
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, specifically using a browser extension installation pretext to deceive the user. It contains multiple external URLs, some of which are hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of the user's trust to download and execute further payloads.

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
  • 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://traffnew.ru/strik?utm_term=voice+recorder+app+for+samsung+galaxy+s8 PDF link annotation
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/278ae4fa7b72c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_5fa2f7e898ece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fad4dfd3233c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5f9bb5e8420c5.pdfIn PDF document text
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/9536017.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/meben_banox.pdfIn PDF document text
    • https://lipitedo.weebly.com/uploads/1/3/4/3/134380968/6291184.pdfIn PDF document text
    • https://pojarepuvoweru.weebly.com/uploads/1/3/3/9/133999230/9bd09bf37e8f05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453551/normal_5fb92a75f32bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5f96122236fa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fd626d294b98.pdfIn PDF document text
    • https://xotoxagat.weebly.com/uploads/1/3/4/7/134753993/de4d8c47b8a7f7.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/retisovojor/42950396682.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/manual_megometro_fluke_1503.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_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 5804 bytes
SHA-256: 90796c54b97eecc3522d5fe7f8a23b7ce3050fa1acc1400bb9dfea1217b19758
font_01_sfnt_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 10532 bytes
SHA-256: 1916a00b7e16edb3adf7a33d2c4c9c5b143c2cabe60872770774538d5c53a463

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