Malicious PDF — malware analysis report

Static analysis result for SHA-256 c584f8bcc2b53fc5…

MALICIOUS

PDF

63.6 KB Created: 2021-03-03 04:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7c3b3279b0b7e4f4a5e403e422caf888 SHA-1: 0c0a6692043bb436d19b248300af8bbe80a8fb9c SHA-256: c584f8bcc2b53fc581054d30bbb93a4ecce369e2c7abdfa496ed7d80876138f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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
  • 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://druttle.ru/123?utm_term=polaris+280+bag+leslie%2527s PDF link annotation
    • http://vovodofozufora.iblogger.org/namizeza.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/vampire_diaries_season_3_episode_1_soundtrack.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/kerakelo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5fff960de70f8.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/47371939556.pdfIn PDF document text
    • http://sonarosefima.iblogger.org/sat_scores_by_race_and_gender_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/hjcqG6T/83207470370.pdfIn PDF document text
    • http://tilosume.iblogger.org/wifeladanulelawajavutafa.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/fWjeXig/sufow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijiwaras.onlinewebshop.net/27675582593.pdfIn PDF document text
    • http://nabafurulevu.epizy.com/97079472986.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_off0000badc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADC 5496 bytes
SHA-256: 0f971328de30ca1887bb05084c941c4a4c30dd9db9f671319419b93182634247
font_01_sfnt_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 10260 bytes
SHA-256: 0eed66a53fc1f793e193b9adad2bb52243cb79890837bc734059685498601535

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