Malicious PDF — malware analysis report

Static analysis result for SHA-256 52be52bdc7f65cef…

MALICIOUS

PDF

33.9 KB Created: 2020-04-15 03:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f693712ac0b38ab484e8ad3ebd1cfe7e SHA-1: f7e421542a7f9461a1cf1fa609853b8e32832bd6 SHA-256: 52be52bdc7f65cefd5ee01bb9466c03f80c34031ecf804bbfb4b0f252ae0cb46
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution mechanism for other malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the ability to determine specific payload delivery or execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://centexpe.com/uploads/1/3/0/5/130589145/130589145.html#ambari+kannada+movie+full
    • http://holoqual.ch/uploads/1/3/0/6/130620972/wojupabevulilip.pdf
    • http://demystifydating.com/uploads/1/3/0/5/130588165/4db4d522.pdf
    • http://www.lyp88.net/uploads/1/3/0/3/130313106/begitaze-mifazemet-noletekapi-gonovaneradipo.pdf
    • http://paroute329.com/uploads/1/3/0/2/130289211/polepavew-dozar-teloxewa-xomilali.pdf
    • http://jaymivictor.com/uploads/1/3/0/9/130969690/sabalewoxu.pdf
    • http://whatdoyoureallywant.org/uploads/1/3/0/6/130604720/818b8041c4f.pdf
    • http://amsap.us/uploads/1/3/0/9/130969899/kimowiti_dafarej.pdf
    • http://gardengaterentals.com/uploads/1/3/0/7/130775529/fosiradag.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_off000053cf.bin
087b0c4650ec2dcc5cd5e7e8b0883320eb4a05ae6a9d60b2dceff5b1e23d59c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53CF 7924 bytes
font_01_sfnt_off0000727f.bin
7466f12abaaa7f3061b2eee0fbea2aff938e674d3fe107531bc2e00f9f0dfbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727F 2600 bytes

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