Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cfaa356fda26fc…

MALICIOUS

PDF

50.0 KB Created: 2020-04-07 15:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e19a02145768092cc4784c6ce2139219 SHA-1: f7f142ca3ebcc8225ddf72196ecf0c90a7469e3c SHA-256: 40cfaa356fda26fcb8d4fd78835370eebcf138bdc8dfd40ea170321a7d6e9f74
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for distributing malware or conducting phishing attacks. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'software training' and includes URLs that are likely part of a link farm designed to redirect users to malicious content. The presence of many similar URLs across different domains suggests a coordinated effort to host malicious files.

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://aspiretolove.com/uploads/1/3/0/7/130775916/130775916.html#past+perfect+museum+software+training
    • http://galyencustomcoatings.com/uploads/1/3/1/3/131382828/de5944900b22978.pdf
    • http://scibhl.com/uploads/1/3/0/4/130476412/02754e752477a99.pdf
    • http://pyratesandfaeries.net/uploads/1/3/0/6/130605278/wodujejo.pdf
    • http://undergroundnola.com/uploads/1/3/1/3/131380183/legololifamujik_pobonaloxovade_sugaxemufem.pdf
    • http://suerayreads.com/uploads/1/3/0/6/130603916/barabugumakakesezano.pdf
    • http://hummingbirdlaneorganicflower.org/uploads/1/3/0/5/130543539/1180147.pdf
    • http://onlinemobilesp.shop/uploads/1/3/0/9/130968933/pizivororewidosarini.pdf
    • http://happyfroggy.net/uploads/1/3/0/6/130639379/zariduwelodefap_dobuzizasuloli_padedulije_dedisiv.pdf
    • http://zarastreaming.com/uploads/1/3/0/8/130874469/boviput.pdf
    • http://donaldpapaibooks.com/uploads/1/3/1/1/131163615/jobivifijezubat.pdf
    • http://kidsbookbookclub.com/uploads/1/3/0/7/130738861/588326.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_off00009095.bin
f113f4ef614761ac4c1b3689f3052bad6f590be71e27c7b8ead6680162b1fa4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9095 8612 bytes
font_01_sfnt_off0000b193.bin
41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 2600 bytes

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