Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ef10fc51240e05…

MALICIOUS

PDF

40.8 KB Created: 2020-04-09 16:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 27f828c6b11dbbc05b61e273c6639768 SHA-1: f4a599da32ed57439531945a235b802f85e6f08d SHA-256: 48ef10fc51240e05a627e1fdc44f1b753b7f8b9925ab16617df41ce3a2506d58
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external PDF files hosted on various domains. The document body, though partially corrupted, contains a title related to 'potential of hydrogen in the human body' which appears to be a lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://thebestmanyoucanbe.com/uploads/1/3/0/7/130775080/130775080.html#que+es+el+potencial+de+hidrogeno+en+el+cuerpo+humano
    • http://sgmpeople.com/uploads/1/3/1/4/131452963/5311118.pdf
    • http://wishuponacard.com/uploads/1/3/0/4/130483509/23dfe.pdf
    • http://phillyaphrodite.com/uploads/1/3/0/5/130543383/bc78ba94ba715.pdf
    • http://conscience-ai.net/uploads/1/3/0/4/130488248/2457535.pdf
    • http://mechapocalypse.net/uploads/1/3/0/4/130490151/rejox.pdf
    • http://eventsnall.com/uploads/1/3/1/3/131398598/d0c4e264.pdf
    • http://chezswann.com/uploads/1/3/0/6/130620594/ropegujo.pdf
    • http://motomomfuel.com/uploads/1/3/0/6/130621022/lijorubenolaviwinuz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063fd.bin
71d3eef285a877c52d508e17f7cd06235d1bfddb430894c90c0914ca9713c83c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FD 7352 bytes
font_01_sfnt_off00007f3a.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3A 16036 bytes

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