Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be6a6ca7eca09f8…

MALICIOUS

PDF

46.5 KB Created: 2020-03-07 14:06:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d326a2fbe7213df0f6e956dac9f3f64 SHA-1: c5462d8bd08fc42dc3bf6239682cfc143fd967a8 SHA-256: 2be6a6ca7eca09f857b42415a3899555a986ae466412956896d6e6f42e3d4abc
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 on various domains, a technique often used for SEO spam or to distribute malware. The ML classifier strongly indicated maliciousness. The document body contains text related to 'Photoshop cs5 system requirements windows' and the authoring application, suggesting a lure to attract users to click on 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://viajeroaaa.net/uploads/1/3/0/8/130874289/130874289.html#photoshop+cs5+system+requirements+windows
    • http://lazyattack.net/uploads/1/3/0/7/130775012/xurinesesaza.pdf
    • http://calasanzpbavaro.edu.do/uploads/1/3/0/2/130289163/viwosatumoni-xazixafixoli-warosoridurazo-sosetifulorem.pdf
    • http://normandyoptical.biz/uploads/1/3/0/6/130620547/51f0366.pdf
    • http://michaelakwoka.com/uploads/1/3/0/4/130477249/kexafidewemegi.pdf
    • http://aclassta.com.au/uploads/1/3/0/6/130639557/tureneg.pdf
    • http://posh-event.com/uploads/1/3/0/9/130969316/wedatuwesito-niximonu-nazobutokiz.pdf
    • http://www.druganddiseases.com/uploads/1/3/0/4/130483739/fesulakexupuz.pdf
    • http://www.comingsoon.nuggwholesale.com/uploads/1/3/0/2/130270951/wegidiw.pdf
    • http://speakarts.com/uploads/1/3/0/5/130589260/vudejojud.pdf
    • http://spiritualfitnesswithbobbyo.net/uploads/1/3/0/6/130639841/golosabalixisulupi.pdf
    • http://mickeyandmalia.com/uploads/1/3/0/3/130312957/9305414.pdf
    • http://addaihealthedu.net/uploads/1/3/0/5/130551182/2661bc5ae2.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_off00008c77.bin
cca86e4377f1be73227705d9049b29dd65c062ca096a0a9d4b1738baf11a3b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C77 8584 bytes

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