Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c43eb98853c09d8…

MALICIOUS

PDF

70.9 KB Created: 2021-01-14 03:05:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 59995eeb361cdc101eeed19bd920718f SHA-1: e87712b6cc5460ae723f55f01b7987e0784c4ec5 SHA-256: 7c43eb98853c09d8ea7056c64083b263076367bea9decd8f6d103d6cf655816d
170 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a malicious redirector and uses urgency and invoice lures. The embedded URL, https://ggtraff.ru/123?utm_term=what+is+a+purchase+invoice+document, is flagged as malicious. The document's content, though partially obfuscated, suggests a phishing attempt to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ggtraff.ru/123?utm_term=what+is+a+purchase+invoice+document In PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/bubebakadolinigirozokajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_5f97c1445ab85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5fe95379c3bb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_5f95c18b9d119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450351/normal_5fcaec90bb404.pdfIn PDF document text
    • https://cdn.sqhk.co/ratugetaj/309ibKh/61365745099.pdfIn PDF document text
    • https://site-1177563.mozfiles.com/files/1177563/26437091007.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/rujabepifar/research_article_example.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/zefidudawos.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/wikifafelabu.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/bpsc_mains_question_paper_2015_in_hindi.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_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 5352 bytes
SHA-256: 6a9f0c7a082cca67006f59563cc5f4398cd02ca58ea154f8c5cafffa650725aa
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 10600 bytes
SHA-256: b8b72949943f9857cc0a61a3dd12811d52303e51bb3ac328111bd47afc847096

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