Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8057e73304e88a…

MALICIOUS

PDF

75.2 KB Created: 2021-01-06 11:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9a6e1b14cadad3858fb0600261c884d1 SHA-1: d2d48dedeb521b31c305c1541a6fd8c0459d8230 SHA-256: fb8057e73304e88a339d438107c748cfefe5741cc35f39f1898b6a0366b0106c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=tieu+su+nguyen+tat+nhien'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL within the document body suggests an attempt to lure the user to a compromised site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/123?utm_term=tieu+su+nguyen+tat+nhien In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_5fada8d22346c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_5fb428306a286.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/bzyGjjY/space_survival_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/hghdjaJ/smart_retailer_load_wallet_online.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/9Cgjr8n/62993130519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5fcd9eee34a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_5fe67a230d563.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/5ieVcic/981374505.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/ddij0Ap/lerabisapudo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8f921d29-a9da-41ec-ae80-9e264cc7347c/surprised_by_hope_study_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 4640 bytes
SHA-256: 9ceb782b43336e02f21b35f503527f5a6854b6f15b90a47a949d13938b1cef33
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 10436 bytes
SHA-256: dae60435d549969b7b7f47ea226944fe88ba62debd9bfa5280839f16a53bb8d4
font_02_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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