Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a71f7adad8288d1…

MALICIOUS

PDF

68.0 KB Created: 2020-12-22 16:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c27afc88c3325afc85c2dc49cd432b94 SHA-1: 7bbc58c038404aef31bb7f5f511fc66cb8fc1e00 SHA-256: 2a71f7adad8288d1d326015f719374f196ba8fb1e2113eb0ef7cc5c12b119e45
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'trafftec.ru/strik', suggesting a phishing or malware distribution attempt. The presence of embedded links and the 'PDF_SEO_LINK_FARM' heuristic indicate an attempt to drive traffic to external sites, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=fill+the+glass+game
    • https://gobitinu.weebly.com/uploads/1/3/4/9/134902795/5792490.pdf
    • https://kibasixeb.weebly.com/uploads/1/3/1/4/131438563/sepikaxafu_jetotugezulawif.pdf
    • https://gitapobukelagij.weebly.com/uploads/1/3/4/2/134266265/9231698.pdf
    • https://jafutefas.weebly.com/uploads/1/3/4/4/134489285/vuxelotogagimo-pinukav-vutuf.pdf
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/notokegagaluku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5a5fdf9866f3fd2f44310/t/5fca71129e96e23453ffb9a4/1607102748344/badaxilajimemoti.pdf
    • https://s3.amazonaws.com/zifilobesumafi/32952391945.pdf
    • https://static1.squarespace.com/static/5fc5126227a199023ad04ca4/t/5fc6049961e25426e1069e0a/1606812829048/naneluwaj.pdf
    • https://uploads.strikinglycdn.com/files/815e6d96-3e2a-4db3-8d6a-f752e13e180f/24712713605.pdf
    • https://static1.squarespace.com/static/5fcdebd2c2968904bcc581e9/t/5fd1f5a48185f4776a118266/1607595428949/1121051203.pdf
    • https://static1.squarespace.com/static/5fc5491a403f5353fdb28df9/t/5fcb66fd9d29b56e4d017bbf/1607165695235/buwefimagexedigogogisub.pdf
    • https://static1.squarespace.com/static/5fc3789f084698658e6e9449/t/5fc81438ec83506b046b1113/1606947897317/25550993612.pdf
    • https://static1.squarespace.com/static/5fdd391cd610986319751208/t/5fde029fc18bd5077c939eae/1608385183570/relosi.pdf
    • https://uploads.strikinglycdn.com/files/51bcfba1-a8b8-455b-805a-e92dbb6d2169/53556896858.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_off0000ce03.bin
e97cec17a1af184ba8301f7dde5e988e04b23d1e58e40fdf9e1d37cd101303e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 4960 bytes
font_01_sfnt_off0000dec0.bin
01cfa8794fa3ebc5cc8f215be3cb56ccdeaf54b7b570e6559ee127586411a8f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 10848 bytes

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