Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f5c4e9721d2b3c…

MALICIOUS

PDF

49.7 KB Created: 2020-04-08 20:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 454c5e8c18b5cfec5966d15cc3106470 SHA-1: 2b66f1f8f18c045706f243730a8acd73ff02a83a SHA-256: 64f5c4e9721d2b3ccd063e9b7dade1acbbc6079e1b2d19e364bab11be887b8a7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body mentions 'Blender animation windows 7', likely a lure to entice users to click on the embedded links. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a malicious intent, possibly to distribute further malware or phish for information.

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://assetrecoverylt.org/uploads/1/3/0/2/130288579/130288579.html#blender+animation++windows+7
    • http://spraytancollegestation.com/uploads/1/3/1/3/131379801/xuvogobe.pdf
    • http://cheronscareercanvas.com/uploads/1/3/0/5/130550859/wofunubat.pdf
    • http://auroraenergyresearch.info/uploads/1/3/0/8/130874128/12708fae8a.pdf
    • http://scoutvids.com/uploads/1/3/0/5/130551586/lobavi.pdf
    • http://angelanagle.com/uploads/1/3/1/4/131482963/wataxolisuluwikij.pdf
    • http://aryansuku.space/uploads/1/3/0/9/130969757/nufetozutu.pdf
    • http://mcelveenforchairman.com/uploads/1/3/0/6/130620370/gopevuj_wuvilepagavigob_dewilo_xuguvegaboboni.pdf
    • http://americanheritageamish.com/uploads/1/3/0/2/130288510/dedebefuzige-deverodolowax-kazelo-jonekefesek.pdf
    • http://proacademycoach.com/uploads/1/3/0/9/130969921/ce21de3556a8f3d.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_off00009b05.bin
6d5e4cc7dc44a18c0fd8b3a1848f96a4f5635f7835a9921475ec4f4503e3782e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B05 8064 bytes

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