Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e79a001374d42e1…

MALICIOUS

PDF

38.5 KB Created: 2020-04-02 07:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0679df8f243a979736cfe07bbd980baa SHA-1: 2ba5baca896e7d4cf1fa86290baf358cbcc8470b SHA-256: 0e79a001374d42e1deac079b6e4e225854e36eb4534d294509e3d69fcf4886f0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://riversidecountyhistory.org/uploads/1/3/0/7/130739897/130739897.html#el+relieve+de+europa+mapa
    • http://get-solutions.net/uploads/1/3/0/6/130639173/a3b0f6b845f6c.pdf
    • http://alainanddanielle.com/uploads/1/3/0/2/130289540/rarilafemobasit_damumuxutiful_gawiremadaw.pdf
    • http://ukopedestal.com/uploads/1/3/0/5/130542982/689fac8.pdf
    • http://chappyssportsmemorabilia.com/uploads/1/3/0/7/130776067/mewapowawobovo.pdf
    • http://hamilton505.com/uploads/1/3/0/2/130270761/4851315.pdf
    • http://groene-zorg.nl/uploads/1/3/0/3/130313088/99d84010.pdf
    • http://www.homesteadheritagecoop.org/uploads/1/3/1/4/131408439/7e84b.pdf
    • http://wordythoughts.club/uploads/1/3/0/4/130483270/pugotabiraka.pdf
    • http://procine.co/uploads/1/3/0/6/130620438/dukesatiju_mebuxoliwuk_lenawoxovapubim.pdf
    • http://mhbeans.com/uploads/1/3/0/7/130776078/4652ee.pdf
    • http://creationsbypinky.net/uploads/1/3/0/2/130287872/6686422.pdf
    • http://luccacosmetics.com/uploads/1/3/1/0/131070583/232afd8a66b7.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_off00006ad9.bin
df5d97db772bbc69511375505dbf276ce29069d53cad1e5781e5a19f6d159391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD9 9352 bytes

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