Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb56e3ecc9989fe…

MALICIOUS

PDF

36.6 KB Created: 2020-03-19 03:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c587d2fbc3d9fb1a3b6ac4df97fa22b1 SHA-1: 145b3524c31be26ee14e7fdf84d427cad9e54163 SHA-256: dbb56e3ecc9989febad501f9eafc83e493c19658726551f5ca6dc69e0d963786
94 Risk Score

Malware Insights

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

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 malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm activity. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link distribution.

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://oralkami.com/uploads/1/3/0/7/130776047/130776047.html#filosofia+realista+pdf
    • http://www.potterypipes.com/uploads/1/3/0/6/130620567/7861700.pdf
    • http://walkermoore.org/uploads/1/3/0/4/130476074/a43bae3221.pdf
    • http://naderafzalan.com/uploads/1/3/0/2/130270898/wufikabepazawel_memonajosakuza.pdf
    • http://tans2toes.com/uploads/1/3/0/4/130475973/82ae0d906.pdf
    • http://cesartechnologiesltd.com/uploads/1/3/0/6/130604342/dujuxupinukotebugil.pdf
    • http://energy-method.de/uploads/1/3/0/8/130873971/663f2.pdf
    • http://sexywithclassmagazine.com/uploads/1/3/0/4/130490774/3847914.pdf
    • http://pitchless.net/uploads/1/3/0/6/130621238/1588201.pdf
    • http://loveplaylearn.com/uploads/1/3/0/6/130620469/jadizoseri.pdf
    • http://chinasummercamp.org/uploads/1/3/0/2/130271157/dovurosoniwedilosu.pdf
    • http://mykief.com/uploads/1/3/0/5/130588210/1286893.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_off000065a7.bin
d4426fc7baf2ce167c71c4dbbcc2c792542d2af60bf4ce36d65a940fb2336585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A7 8496 bytes

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