Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfe9e41d14fb8af…

MALICIOUS

PDF

34.1 KB Created: 2020-03-30 03:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 015f229edd2a37ac8a1ff3832c629726 SHA-1: e2d3be0f8f33a519f49442b001beb26528b68b2b SHA-256: 0dfe9e41d14fb8afc09268ae3c81b4a298092713b2ab5a9fa7704d2ec18e70fe
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the PDF structure itself is indicative of malicious intent, likely to manipulate search engine results or distribute further payloads.

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://benkregel.com/uploads/1/3/1/3/131379029/131379029.html#sonic+large+tater+tots+carbs
    • http://campdixon.com/uploads/1/3/1/0/131070619/fumofatagokijumuxo.pdf
    • http://walkthedog.ca/uploads/1/3/0/2/130270996/5713923.pdf
    • http://fishbowllabs.com/uploads/1/3/0/4/130476974/pilor.pdf
    • http://haamsa.com/uploads/1/3/0/7/130775241/piponepel.pdf
    • http://dimondecor.net/uploads/1/3/0/2/130291572/xulemape.pdf
    • http://tomboyoriginal.com/uploads/1/3/0/4/130475923/9490286.pdf
    • http://yudrew.com/uploads/1/3/0/2/130272278/wigixulidag.pdf
    • http://clubescuelasolidaria.com/uploads/1/3/0/3/130313619/2843070.pdf
    • http://minashoppingzone.com/uploads/1/3/0/6/130621698/forepegisaxoloje.pdf
    • http://ramysjoy.com/uploads/1/3/0/2/130272362/110c390179881.pdf
    • http://rocktopiastudios.com/uploads/1/3/1/4/131407408/1440288.pdf
    • http://sharpening901.net/uploads/1/3/0/2/130287799/xibutexejenofurireru.pdf
    • http://dragonmountain.net/uploads/1/3/0/6/130640044/67706b04dd62.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_off00005e7a.bin
b039255d8acba4735127b47fa559fac703e9d3a179faae9a92152de866f4b4f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7A 7392 bytes

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