Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcbacc11162eb90…

MALICIOUS

PDF

86.1 KB Created: 2021-01-05 12:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d6b674b4347e1bbb272bfcc253afc4 SHA-1: 154b4644d714a65584485757ff2b9732ecdfc326 SHA-256: 4bcbacc11162eb904f6f029619645a1a3d612d90ce6d5e0af7c0b9501f6eddc2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan distribution attempt. The presence of a large number of external links, including one pointing to 'trafftec.ru/123?utm_term=apk+spotify+mod', suggests a lure to download a potentially malicious application. The PDF structure itself is also flagged for containing a mass external PDF link farm, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?utm_term=apk+spotify+mod
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fdebca8a6a48.pdf
    • https://mujetuzavos.weebly.com/uploads/1/3/4/2/134266282/kesugazezovif-tipipiti-pexibitigimi.pdf
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fd11b53894c9.pdf
    • https://static.s123-cdn-static.com/uploads/4484169/normal_5fedd15f077b1.pdf
    • https://cdn-cms.f-static.net/uploads/4374686/normal_5faf165662b59.pdf
    • https://cdn-cms.f-static.net/uploads/4411932/normal_5f95bf7aee3a8.pdf
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5f963e05a2f22.pdf
    • https://static.s123-cdn-static.com/uploads/4380858/normal_5fed2e4f4d980.pdf
    • https://cdn-cms.f-static.net/uploads/4458137/normal_5fad657568927.pdf
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f9d499f5141a.pdf
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5fe424b973972.pdf
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/9ea9a.pdf
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5f9a12999971b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ee4e1b8-12d2-4753-a8fd-839e4939d5f5/52907403738.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc3.bin
670a02014ad8182362fcadac9438449752fea7c6bc032cd36bbd1e7c1c08c656		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 5004 bytes
font_01_sfnt_off00010ed1.bin
6cefb7c58d28fa9750ba4b886c50d684329ce397ab5f4c5041c275c55b25b1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 11448 bytes
font_02_sfnt_off0001358f.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1358F 16312 bytes

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