Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ff88a70ff44b48…

MALICIOUS

PDF

43.4 KB Created: 2020-03-21 13:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1bb1f011e8c8ed1631d592bd85024628 SHA-1: b426723a175d6a9206147146123b5c59197a823f SHA-256: b0ff88a70ff44b48155d0425b0920841efd51babb16827b52bffd41741e037fd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains text related to education and includes URLs that point to other PDF files hosted on various domains. This suggests a tactic to manipulate search engine results or to distribute further malicious content through a network of linked documents. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://myknitlife.com/uploads/1/3/0/6/130604391/130604391.html#importancia+de+la+educacion+fisica+en+el+desarrollo+integral+del+ser+humano
    • http://mysifortenbery.com/uploads/1/3/0/8/130814241/d3719658c6aa.pdf
    • http://mfengshui.com/uploads/1/3/0/5/130551309/8446745.pdf
    • http://coloradoartclass.org/uploads/1/3/0/6/130621075/sepagabujuk_roburumosalef_lunetopu.pdf
    • http://mistyislandbernese.com/uploads/1/3/0/7/130776245/114acbf6555.pdf
    • http://www.elainecasephotography.com/uploads/1/3/0/7/130739904/sojugutu.pdf
    • http://lastruggle2purpose.com/uploads/1/3/0/2/130287296/livedagovamaraj.pdf
    • http://oceanassassin.com/uploads/1/3/0/6/130604109/vutatubiko.pdf
    • http://boobybalm.com/uploads/1/3/0/3/130379673/7627500.pdf
    • http://refsrus.net/uploads/1/3/0/9/130969842/ralogorefaxemopo.pdf
    • http://lojrrim.store/uploads/1/3/0/5/130550756/6617862.pdf
    • http://blacksinphilanthropy.net/uploads/1/3/0/5/130551599/b77b40ed.pdf
    • http://punawaiora.com/uploads/1/3/1/1/131163651/c3e55f68a8ee79.pdf
    • http://leroyleslie.com/uploads/1/3/0/8/130873908/1d3530ce38c0.pdf
    • http://69-183-186-246.litchfieldarc.org/uploads/1/3/0/4/130488779/7738971.pdf
    • http://mdsassociates.org/uploads/1/3/0/8/130814042/basokem.pdf
    • http://janaleeferreira.com/uploads/1/3/0/5/130539933/d4bc9cd.pdf
    • http://steambrush.store/uploads/1/3/0/5/130540146/a90a945.pdf
    • http://thecommunityengineer.com/uploads/1/3/0/2/130289694/e04befa940095b.pdf
    • http://mx.rossdillon.com/uploads/1/3/0/9/130969858/sodakabixufolizi.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f53.bin
02cbc4541e7a115c412e717ff4c8b8b68378d1132609b621a9ee118ae0cf2e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F53 8128 bytes

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