Malicious PDF — malware analysis report

Static analysis result for SHA-256 959ea7ff9fe4c6d0…

MALICIOUS

PDF

67.2 KB Created: 2020-11-11 13:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50030490c193c0717d46ffca5be64d1f SHA-1: 18514ff51ae2227980aede0ffe3161fa4a9c2795 SHA-256: 959ea7ff9fe4c6d0e34f9fe5483c243e57fe908070e8ad848cd37efee3d5b6a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm. It contains numerous external URLs, many hosted on Weebly, suggesting an attempt to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://traffset.ru/123?keyword=gunblood+free+online+games
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/jovifigote_vijal_xomen_sazibujokol.pdf
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/05155d31df3.pdf
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/d7d5e001b28b4.pdf
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/zivuwesedazatuw.pdf
    • https://nakoliveb.weebly.com/uploads/1/3/4/5/134503524/5914114.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tadovu/bomebabizigipuzojijaga.pdf
    • https://uploads.strikinglycdn.com/files/46e61a91-dc9b-40b8-88f7-2d26f210d144/79451328993.pdf
    • https://s3.amazonaws.com/juvetaso/23131989289.pdf
    • https://s3.amazonaws.com/jinabom/serological_diagnosis_of_syphilis.pdf
    • https://uploads.strikinglycdn.com/files/5a2caaea-2454-456b-b3bb-23b9db37ea05/84521987960.pdf
    • https://s3.amazonaws.com/zufojadibi/kowobel.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_off0000cb94.bin
679454c0acd382f5f6377eb24601125c581d5386d2926dd8a533b3314e630a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 5396 bytes
font_01_sfnt_off0000ddd9.bin
66769367fe01e2f8736c66d602fdae229fc70f3692df491636dbf9b1432d8229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 10220 bytes

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