Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c03ff6d3c578295…

MALICIOUS

PDF

71.3 KB Created: 2020-11-20 06:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9d652b8ccd1be24286d8671b1d32087 SHA-1: 56467102a86c78556ad337b0f6079b4031aaaa7a SHA-256: 2c03ff6d3c578295617b26481a4d0e58cb2bcfd40eb45d11bc868413ed29c3c7
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a known malicious redirector. The document body, though partially corrupted, suggests a lure related to downloading tools, and the presence of a password-protected archive hint indicates an attempt to bypass security measures. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=samsung+frp+unlock+tool+apk+download
    • https://cdn-cms.f-static.net/uploads/4459166/normal_5fafb2f76f0b6.pdf
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5f8defcbbf618.pdf
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/103702.pdf
    • https://cdn-cms.f-static.net/uploads/4424666/normal_5f98a741947f3.pdf
    • https://cdn-cms.f-static.net/uploads/4403680/normal_5f97b6f310f5e.pdf
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f97635bdcc05.pdf
    • https://vakigosem.weebly.com/uploads/1/3/4/4/134480352/5488ea8e87db21c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8dd85ae9-f966-492e-8348-e40181e9b0b7/46222539842.pdf
    • https://uploads.strikinglycdn.com/files/c429dc35-0ca3-4893-9a4d-be92a72106bd/zumozesixa.pdf
    • https://s3.amazonaws.com/zobuwubedak/67629496413.pdf
    • https://s3.amazonaws.com/pusolefosex/44172730973.pdf
    • https://s3.amazonaws.com/zidosozawok/kopitalexapasusojisen.pdf
    • https://s3.amazonaws.com/foneniz/rounded_business_card_mockup_psd_free.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_off0000d80e.bin
aecefe7bd7d8a08be2b07561260c0f659fe2d2f64a802a4c21d74276e1babb3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 5736 bytes
font_01_sfnt_off0000eb98.bin
dcf396b948bdee4dbd7d363df8f1c499c77c2ee9a3d2075f9ed094a1901856fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 10800 bytes

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