Malicious PDF — malware analysis report

Static analysis result for SHA-256 0642f1b63ac716ce…

MALICIOUS

PDF

89.9 KB Created: 2020-12-24 16:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d382a2088fe09c04ad838a3fe2c0361 SHA-1: d5fe8c75779d06e332b6a93e9245cd1e4fdc34af SHA-256: 0642f1b63ac716ce9edf86541a02f5e8417776970bad565c5fe24012c4026938
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a "link farm" by heuristics, suggesting a malicious intent to direct users to potentially harmful websites. The presence of an embedded URL and the ClamAV detection as 'Pdf.Phishing.Trojan' further support a phishing or malicious redirection attack. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=average+velocity+formula
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f897ef6220a8.pdf
    • https://static.s123-cdn-static.com/uploads/4464877/normal_5fc8c738c6317.pdf
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5fc7c99acd4ce.pdf
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/cc18584a1f3.pdf
    • https://cdn-cms.f-static.net/uploads/4489593/normal_5fbbcdac667d6.pdf
    • https://cdn.sqhk.co/nebuneduzib/59vbgjc/baby_names_that_start_with_k_or_c.pdf
    • https://cdn.sqhk.co/zatugudaxaji/qgdtPie/nanidokimatarelarisobi.pdf
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5fb4f5b638111.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e6d3029-1913-4063-b74c-f4c58a43b717/personal_representative_deed_maine.pdf
    • https://uploads.strikinglycdn.com/files/3b4d59ae-75d3-41c4-8eb3-525fd8173a42/wuzusi.pdf
    • https://uploads.strikinglycdn.com/files/924bde06-e035-4dbe-b70a-c813aa482f7f/28393597163.pdf
    • https://uploads.strikinglycdn.com/files/ff85410e-79a2-4716-af14-a9d074e9201b/seattle_windstorm_2006.pdf
    • https://uploads.strikinglycdn.com/files/97c132d9-dc86-4435-8d62-5141eb8fdce2/50040270641.pdf
    • https://uploads.strikinglycdn.com/files/e2b7b92e-4902-4402-a417-c17703a6b228/6018416961.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_off00010313.bin
f6e05324648e7dd4827dbb568201fe05bd3aa56b5d9fd4e8c8bf85712a52fe96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 5172 bytes
font_01_sfnt_off000114b1.bin
329fb7027f83430ac25eddfdd61577572f17752acc8192a1101d788420667e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 15360 bytes
font_02_sfnt_off0001459b.bin
f840190e6149b1f653583f0df975cb294a3897ead61d298e81955a00290d95c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1459B 16192 bytes

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