Malicious PDF — malware analysis report

Static analysis result for SHA-256 4888cf9df104996c…

MALICIOUS

PDF

36.4 KB Created: 2020-06-05 20:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3260649dd2c08f3170f16afab9210056 SHA-1: 2d31867c024cd38efe3bd3c088bc39c3150cac4d SHA-256: 4888cf9df104996cf58b7ce50edb40b5ad963880dfc0eaa3c60cc4df7062017d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body also contains references to these links, including one that appears to be a lure for 'Thomas calculus book 11th edition pd'. The primary purpose seems to be directing users to a network of domains hosting numerous PDF files, potentially for SEO spam or to distribute malware. No scripts were extracted, and the document body itself does not contain malicious instructions, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://photosbylory.com/uploads/1/3/0/5/130544232/130544232.html#thomas+calculus+book+11th+edition+pd
    • http://ukiahpost.net/uploads/1/3/0/2/130287847/muditevalapesib_vitatosari_peviwezizu_kulavorane.pdf
    • http://homesbycoronado.com/uploads/1/3/0/6/130620420/823cc9914060.pdf
    • http://agapiredesign-fr.devsite-1.com/uploads/1/3/0/2/130289428/reximutixilis.pdf
    • http://photosbylory.com/uploads/1/3/0/5/130544232/terms.html
    • http://photosbylory.com/uploads/1/3/0/5/130544232/dmca.html
    • http://photosbylory.com/uploads/1/3/0/5/130544232/policy.html
    • https://majokefimev.files.wordpress.com/2020/06/tukolevezajuzuse.pdf
    • https://kitulularuzu.files.wordpress.com/2020/06/15434948074.pdf
    • https://bejuboponoku.files.wordpress.com/2020/06/48681622042.pdf
    • https://ranazibug415793248.files.wordpress.com/2020/06/pufaranodolipefiloselibeg.pdf
    • https://wopigudepe.files.wordpress.com/2020/06/23508496786.pdf
    • https://ladefavabuv.files.wordpress.com/2020/06/44781798182.pdf
    • https://pobukurimu.files.wordpress.com/2020/06/44084765854.pdf
    • https://niredozunoxe.files.wordpress.com/2020/06/sobibonu.pdf
    • https://fesivalodif.files.wordpress.com/2020/06/79174513120.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_off0000610f.bin
d3b158bc33b2fbe1f896237a9a94752dc5d7af72d764093554e8a682618ed393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 10864 bytes

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