Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fa4a22bf205fe1…

MALICIOUS

PDF

41.7 KB Created: 2020-05-21 14:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25bec9f44460c8c72edeebd2e9a5b208 SHA-1: ed0574fa0289de0a24be0c150d386f62888133c4 SHA-256: f7fa4a22bf205fe1714a5bd00a4edfc457b53cef030058d4a8c9c3d875577391
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and heuristics point towards a delivery or redirection mechanism rather than direct exploitation within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://everetttreeservicepros.com/uploads/1/3/1/1/131164066/131164066.html#sonorama+wordpress+%25D8%25B3%25D9%2585%25D8%25A9
    • http://alisterassets.com/uploads/1/3/0/2/130274368/titeferavazebude.pdf
    • http://estudiosarriola.com/uploads/1/3/0/7/130775700/4db9a4.pdf
    • http://srconsultingus.com/uploads/1/3/0/2/130289385/4900686.pdf
    • http://raimestyleblog.com/uploads/1/3/0/7/130775927/9088314.pdf
    • http://mesys-industrial.net/uploads/1/3/0/7/130739754/zelebuxezopuxan.pdf
    • http://bestcoinmech.com/uploads/1/3/0/5/130547286/noxazupazojogemuxado.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fa0.bin
e4662fdcc3595c5b3f51280ea2497a6e58472570e9a203568bf71503d17ce137		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA0 10508 bytes
font_01_sfnt_off000083de.bin
818fff544e1c19a5af29f754c206e1ed36f5ac4ded38035bdf209501e9fbf1e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DE 16496 bytes

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