Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f763e07c4087117…

MALICIOUS

PDF

68.3 KB Created: 2020-12-17 00:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f1c3140e9fbca7c66b47ef907e470eb SHA-1: d00a9ade55003bdf6691ec46d9df3e871eeef199 SHA-256: 5f763e07c4087117017a39197332290d6ebe1b9bcb98de01923bfe047fb7ade0
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm and a redirector to a malicious URL, indicating an attempt to lead users to harmful content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards exploitation of PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=openwrt+luci+manual+install
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fcdffdc9fc5d.pdf
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5fb2a7e5cfec9.pdf
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5f9e0a75272bb.pdf
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/6769710d14.pdf
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd27c458e845.pdf
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f8999835f87b.pdf
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5fa4ec8a40c96.pdf
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5fd131f0575fb.pdf
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fda7907eafbb.pdf
    • https://cdn-cms.f-static.net/uploads/4466165/normal_5fb87936a232e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lunojol/recycled_plastic_ps_6.pdf
    • https://uploads.strikinglycdn.com/files/95129e78-70e7-468d-b9fd-196745f2445e/lerifutakijas.pdf
    • https://s3.amazonaws.com/bevarolimesale/microsoft_office_certificate_of_achievement_templates.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccf7.bin
b4dcc63757689cb34d3ca94911ac01200830c8c81be76f4ec4fe35144472b542		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 5200 bytes
font_01_sfnt_off0000de99.bin
3da338a126ebd93688d6dfa9bd3d80c3f53dba9a4ba93693fa2e48d5fba91799		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 11184 bytes

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