Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd29af952840d33…

MALICIOUS

PDF

54.7 KB Created: 2020-04-05 16:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a63f92572774aaabc3dab781f8e967ff SHA-1: 780c2e124b4e7158ba70b383cd96455f4955b5b2 SHA-256: 7dd29af952840d33bfd0055357c384fa9f34dfc03bd8cd1c1f150ced763f756a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious SEO or content distribution scheme. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content or exploit kits.

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://willispropertyoffmarket.com/uploads/1/3/1/4/131407737/131407737.html#examenes+de+ciencias+naturales+6+primaria
    • http://suziegilmour.com/uploads/1/3/0/9/130969062/488026.pdf
    • http://hostmaster.swindoncabs.com/uploads/1/3/0/6/130603906/4a5fec24cdef734.pdf
    • http://operationalysha.com/uploads/1/3/0/9/130969037/9004969.pdf
    • http://tinkscience.com/uploads/1/3/0/4/130477085/vasojuradudam_wewumaraxekaw_pozikam.pdf
    • http://billzammmitmindcoach.com/uploads/1/3/0/2/130272505/xelekurag.pdf
    • http://eadmed.com/uploads/1/3/0/5/130546543/lujawegad_bisepak_jajopodojab_sebowaped.pdf
    • http://apphub.biz/uploads/1/3/0/8/130814345/6017320.pdf
    • http://techvibes.studio/uploads/1/3/1/3/131379724/lerenefowima-pupaforubow.pdf
    • http://asesoresopticos.com/uploads/1/3/0/3/130379841/zobimututel.pdf
    • http://emily-briggs.com/uploads/1/3/0/2/130289310/wawesiwerilijo_mefepanij.pdf
    • http://bspinportfolio.com/uploads/1/3/0/6/130639282/6009542.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a6c.bin
1957428794578a072b8983e864e5701b52391162abfb2d6d14c6295fa8a16687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6C 6444 bytes
font_01_sfnt_off0000aa2e.bin
b00aa8e4d291b0c4a61fd1940421f7e48e27a2e7404e6266e26c039f47728a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2E 9120 bytes

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