Malicious PDF — malware analysis report

Static analysis result for SHA-256 733ac09fae87dfdd…

MALICIOUS

PDF

75.2 KB Created: 2020-12-21 06:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c3e278a534fbe3a7f6d1481b1d2833f2 SHA-1: 9a367abd7e2a8dd4abb7f905d67d731a5068335b SHA-256: 733ac09fae87dfdd23b3833a769c2bac5cb1cb62ccbb7b19166195ca284649f5
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded links, one of which points to a known malicious redirector infrastructure. The PDF also exhibits characteristics of a link farm, suggesting an attempt to distribute further malicious content or engage in phishing. No scripts were extracted, but the presence of malicious links indicates a clear intent to redirect the user to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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://traffmen.ru/strik?utm_term=ticket+to+ride+europe+online+rules In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404990/normal_5fc97b9fd8224.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/lebegoxaregazaretet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5f893093e4f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_5fd1da4bac756.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/03e0307b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5f94b07e63de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405950/normal_5f93a76d9c6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f9075fe8423a.pdfIn PDF document text
    • https://jawejeletisib.weebly.com/uploads/1/3/4/8/134886371/welav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc50b14104edf1d779bbfda/t/5fd1ea0f871f8c6e595f4204/1607592464881/blackboard_ttu_k12.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_off0000ccee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 7484 bytes
SHA-256: 6bd3cf6d4cfe098e01724ebf509f19fc77a33557ccf33574b3973a87e2f833ee
font_01_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 4868 bytes
SHA-256: 98c8f2d9c8aa1d976ee5f0d625b54b0ce091e8e02834d2ea6eeefa11ad0613c3
font_02_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 13572 bytes
SHA-256: df3df6f6a8935f9e23fa7abdd75aceea2d8c36e88850300644c81c005bc44aa9

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