Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d1bbd5e05d6104…

MALICIOUS

PDF

48.0 KB Created: 2020-04-04 15:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5c9bc67dcac724fcc6343e9c02325c5a SHA-1: bedd757829fb9abfbf0ba99065e71073a1757b73 SHA-256: 18d1bbd5e05d6104b84e97b5b1a70d788fcc31b32107653adf6d325271d797b9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This pattern is indicative of a link farm or SEO poisoning attack, designed to drive traffic or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ecgcore.com/uploads/1/3/1/4/131483194/131483194.html#caracteristicas+del+bosque+tropical+en+colombia
    • http://74-123-76-231.mgwnet.com/uploads/1/3/0/2/130289363/dasikesapiwisalatanu.pdf
    • http://mirandatinaphotography.com/uploads/1/3/0/4/130435596/gusimoseremoxado.pdf
    • http://chattpack.com/uploads/1/3/0/3/130313553/6414612.pdf
    • http://kidskornerboutique.net/uploads/1/3/1/0/131070880/pukipobufukix-fozimobuwamoko-dijiwesafudeg-radiva.pdf
    • http://potentia.ie/uploads/1/3/1/4/131452942/d2205197c08a18.pdf
    • http://emmachristopherlakesassociation.org/uploads/1/3/0/5/130543054/7965645.pdf
    • http://gilcrest-center.com/uploads/1/3/0/7/130738903/9dbaa7d49c.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a28.bin
a6a61f42f4cc0ad8526650db55190e693c36567d81eed3576e20c214d1c72750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A28 9140 bytes
font_01_sfnt_off00009aee.bin
48d51f9a8bcbb569c9341ffcdb419faaf88a6e14d319ef3eace6595145069202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEE 16304 bytes

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