Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6291c993383e69…

MALICIOUS

PDF

66.1 KB Created: 2020-11-14 04:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 20db014b2aac0567bda5c3831117a9b2 SHA-1: dca442b9810ebca68bd1d38fcb6fa0e7db76f284 SHA-256: ef6291c993383e69b8bb1392edfe3485997732405d741f59a5da915ec253331b
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: Malicious Applet T1059.007 JavaScript

The PDF document contains heuristics indicating it is a phishing lure, specifically prompting the user to install a browser extension or plugin. It also contains numerous external links, with one pointing to a suspicious URL that may host a malicious payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafftec.ru/123?utm_term=waves+on+a+string+speed+of+a+wave+lab+answers PDF link annotation
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/4316856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5f90eb8e77a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5fa05c2c6b09a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f8af72421792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_5f8eaccce0e33.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/49e81e.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/gavexilatuvitaz/xozev.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/your_boss_in_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/libro_el_cerebrito.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/xoterif.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/wipusefopefapusozupubi.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/9059925647.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/dnd_5e_is_drinking_a_potion_a_bonus_action.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/63779146298.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_off0000c5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C9 5512 bytes
SHA-256: f7bf436f6733323602d5bfb19e4a95112152a651b4e5e9890774185a31183f60
font_01_sfnt_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 10096 bytes
SHA-256: 13abf977d20ec7cd2ec3d794cd48758721672e26372d24ea6afe666f67cbce3d

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