Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18f3ee20e7de31b…

MALICIOUS

PDF

33.5 KB Created: 2020-06-05 02:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 199df07a5e6a625e839ab0901e3589a8 SHA-1: 72cf82bb56cd44aa782a3258b0c9393528595a0b SHA-256: f18f3ee20e7de31b973684de031c03d744cd701d5bae0c003e03ba9922f44106
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, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains references to 'Empire earth no cd' and the authoring application 'wkhtmltopdf', suggesting a potential lure. The primary purpose appears to be directing users to a network of suspicious websites, likely for phishing or malware distribution.

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://mail.clearskycoaching.co.uk/uploads/1/3/0/5/130543684/130543684.html#empire+earth+no+cd
    • http://apositivelight.org/uploads/1/3/1/1/131163902/4084956.pdf
    • http://whatthehula.net/uploads/1/3/0/2/130272600/8535648.pdf
    • http://4ur.undesirable.us/uploads/1/3/0/7/130775986/lifabavolaxupom.pdf
    • http://knightsbuy.com/uploads/1/3/1/4/131454452/vamumekiseg.pdf
    • http://nxtgensport.com/uploads/1/3/0/4/130436049/lonovozote_xedazej.pdf
    • http://mail.clearskycoaching.co.uk/uploads/1/3/0/5/130543684/terms.html
    • http://mail.clearskycoaching.co.uk/uploads/1/3/0/5/130543684/dmca.html
    • http://mail.clearskycoaching.co.uk/uploads/1/3/0/5/130543684/policy.html
    • https://napofutu.files.wordpress.com/2020/06/jamibijim.pdf
    • https://muvifawovok100143697.files.wordpress.com/2020/06/dazalomegadegukebajuvisu.pdf
    • https://kuraxibe.files.wordpress.com/2020/06/lemoti.pdf
    • https://zinisarov424395058.files.wordpress.com/2020/06/bisajepezudaxufomur.pdf
    • https://silopesazov433664634.files.wordpress.com/2020/06/fesew.pdf
    • https://tetakorure.files.wordpress.com/2020/06/73212859965.pdf
    • https://lamupib.files.wordpress.com/2020/06/90860336760.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_off00004e74.bin
0e509e93a871b98b86ac2e8749101a9606b52d2d78f01025c458b1c39c0b8096		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E74 13088 bytes

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