Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec91408cd645abe5…

MALICIOUS

PDF

94.1 KB Created: 2021-01-17 13:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 54bc93ae1fbdfd64046a7161880b734a SHA-1: baf1c5c0d69985598b441cac17212f1f995f4148 SHA-256: ec91408cd645abe5dcd617952829f6101328fe6ce5aa9dc0f7acc09d65761170
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for credential theft or malware installation. The document contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. ClamAV detection and ML classification confirm its malicious nature, likely serving as a downloader or phishing lure.

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
  • 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.
  • 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
  • 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://trafffe.ru/123?utm_term=balto+characters+in+real+life PDF link annotation
    • https://cdn.sqhk.co/sixojifez/XM94lSM/28104594605.pdfIn PDF document text
    • https://site-1176683.mozfiles.com/files/1176683/66850794865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_5fb735712fbba.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/igBjiTH/reading_between_the_lines_book_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5f9e431e95b72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495042/normal_5fcd3996ef238.pdfIn PDF document text
    • https://site-1172550.mozfiles.com/files/1172550/65753536688.pdfIn PDF document text
    • https://mibubibot.weebly.com/uploads/1/3/1/8/131871690/rituxa-nopelofakuj.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/jgWhhdv/55825407138.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/7jbhihj/96852465398.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/U2D9o7f/hooked_inc_fisher_tycoon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369905/normal_5fceff9b70a62.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/6Mgdk3i/31048136716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486987/normal_5fd97a2bc5713.pdfIn PDF document text
    • https://cdn.sqhk.co/penomufepuk/jjigiSh/95824084017.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/giWVOYx/fake_call_apple_support.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_5f9e878d73580.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_off00013231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 5016 bytes
SHA-256: 429aed51b2a33c305fbb82d85e0f77843cb69435b896e8ec8240b5268d4b984a
font_01_sfnt_off00014339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14339 11744 bytes
SHA-256: b4fb264d17bfafd591c94657a85e990280dd83a679d42bd34869b51b73290d62

Open this report in the interactive analyzer, or submit your own file for analysis.