Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e77735cdab4e76…

MALICIOUS

PDF

37.1 KB Created: 2020-03-09 06:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eacea1ef48b731a2805555a1520c5ae1 SHA-1: 8472e6924556e7c3deb9ee05a486041743538cb7 SHA-256: f8e77735cdab4e7642e82e3df90069d5de2c5fafcc4051173965603b53b03d45
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external links, suggesting a link farm or redirection mechanism. The ML classifier also flagged this PDF as malicious. The document body contains a title related to reading Excel files, which may serve as a lure to encourage users to interact with the embedded links.

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://headblocks.org/uploads/1/3/0/5/130589156/130589156.html#how+to+use+apache+poi+to+read+excel+file+in+java
    • http://oxhxo.net/uploads/1/3/0/7/130739446/buvuvananagab.pdf
    • http://idforensics.net/uploads/1/3/0/6/130620635/2069645.pdf
    • http://moderngentlemanacademy.com/uploads/1/3/0/9/130969893/duveponij-pinow-limuvudemini-lexuz.pdf
    • http://www.annabellecalica.com/uploads/1/3/0/2/130270945/lubemizan-pikezoxodav-vokaze.pdf
    • http://marcschuebellaw.de/uploads/1/3/0/5/130550654/c058231fa.pdf
    • http://dobyhibben.com/uploads/1/3/0/3/130323526/c145d.pdf
    • http://m�leriservice.se/uploads/1/3/0/5/130538994/885d5c6.pdf
    • http://akamaiacquisitions.com/uploads/1/3/0/6/130639636/rerov.pdf
    • http://risingphoenixchurch.org/uploads/1/3/0/8/130813320/tivevuxopikux-bidotadufikiweg.pdf
    • http://polarfx.net/uploads/1/3/0/6/130605112/lukef-jutapidalalasu-negowalelitoj.pdf
    • http://medicaiddrugrehab.com/uploads/1/3/0/7/130775842/29d5d40.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_off00006636.bin
4e9aad0cdda8dfc2ab5d113ca86ca983139061423b1826b8b12e151b7669f184		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6636 8100 bytes

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