Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdbbe8326d62871…

MALICIOUS

PDF

36.8 KB Created: 2020-04-04 14:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a9b90b33d96664332ab5097f3736966 SHA-1: 856e4ecf5faafc83ed53f7d550ca83aba429a1c3 SHA-256: 9cdbbe8326d62871e1e25362cd23dff2e0d667fe466b2f5caef3fa5509dee7b5
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious content. The document body, though partially corrupted, mentions 'Immigration projects for high school students', likely a lure to attract clicks. The PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm, indicating a malicious intent to distribute links across various domains.

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://mitco-solutions.com/uploads/1/3/0/6/130603724/130603724.html#immigration+projects+for+high+school+students
    • http://sekolahberpikirindonesia.com/uploads/1/3/0/7/130739783/711b7.pdf
    • http://cpanel.redkem.com.au/uploads/1/3/0/5/130551190/birowaxudirul-padure-nukipujeraxiw.pdf
    • http://secretnewhomeguide.com/uploads/1/3/0/5/130590054/b73080bec34be6e.pdf
    • http://hostmaster.holyangelsnj.org/uploads/1/3/1/4/131454155/fb8eade5.pdf
    • http://northeastminneapoliselectrician.com/uploads/1/3/0/6/130639861/a270f4ff8b3.pdf
    • http://gray-capital.com/uploads/1/3/0/3/130313471/nefuw.pdf
    • http://queridouniverso.com/uploads/1/3/0/4/130435644/9045178.pdf
    • http://loisnfrimasicecream.com/uploads/1/3/0/5/130588263/kanikatirabix.pdf
    • http://mariemcstocker-hulme.com/uploads/1/3/0/6/130620343/7365448.pdf
    • http://dossys.com/uploads/1/3/1/0/131070420/vuwigex.pdf
    • http://missdustbunnycleaning.com/uploads/1/3/0/4/130478374/1264584.pdf
    • http://cool4climate.org/uploads/1/3/0/8/130874592/pesixu.pdf
    • http://foreverlivingme.com/uploads/1/3/0/6/130605346/7688105.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_off000066a0.bin
1112bd5cbfbd1fac80e38a3d1d04061bd434ee4df5becbd7dbf3a47e1168212f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A0 8440 bytes

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