Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e3884348d4ce3…

MALICIOUS

PDF

42.3 KB Created: 2020-06-13 23:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea2ef4404448c74d33e3986da3035a36 SHA-1: 3586692f515444df4babca93a96c41210bf47041 SHA-256: 4a1e3884348d4ce3a402aa607db0aef1b8756be7af4f4481fb6601227f4e73d0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains numerous external links, with a significant number pointing to other PDF files on suspicious domains. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of these links, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body text, though partially garbled, contains fragments of URLs and what appears to be a title related to a chemistry question bank, likely a lure.

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://thekookas.com/uploads/1/3/0/5/130589278/130589278.html#palme+10.s%25C4%25B1n%25C4%25B1f+kimya+soru+bankas%25C4%25B1
    • http://genesisyi.com/uploads/1/3/0/6/130604547/9470669.pdf
    • http://gesproit.com/uploads/1/3/0/4/130436242/vamixedejoxoz-kovitep.pdf
    • http://ruminationsofasheep.com/uploads/1/3/0/7/130739789/terimukufus_luvurogejijiji_dajuvumudolotug.pdf
    • http://ruminationsofashe
    • https://garuwade.files.wordpress.com/2020/06/55880553349.pdf
    • https://duxogij.files.wordpress.com/2020/06/82691217865.pdf
    • https://remopar.files.wordpress.com/2020/06/nufotureviruwe.pdf
    • https://mugitemos.files.wordpress.com/2020/06/58214183786.pdf
    • https://moxiritaf.files.wordpress.com/2020/06/babukupa.pdf
    • https://kegores.files.wordpress.com/2020/06/lizajepikodizag.pdf
    • https://tigizenawa.files.wordpress.com/2020/06/rewaretoxu.pdf
    • https://tefizewu.files.wordpress.com/2020/06/tosoxozenenedevemaka.pdf
    • https://pulimiwuri.files.wordpress.com/2020/06/jadikuzuxamikomu.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_off0000782c.bin
b8190ddd3ed30b31ec0900f826f19232fdb8bd48fb7a726a180c3189db92c442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782C 11320 bytes

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