Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fab7b4d0314c31b…

MALICIOUS

PDF

40.1 KB Created: 2020-04-05 13:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6527991e9bed392f3754488c7e7ebf5d SHA-1: 01101c088a50461acd0952ac767638ab94d7b893 SHA-256: 5fab7b4d0314c31b98b59e741a852dd9ba5a2db6ccec08cdeaf0024c50c65234
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are structured as SEO-optimized PDF slugs, indicating a link farm or traffic-driving scheme. The primary URL, http://lovingfarewells.info/uploads/1/3/1/4/131437619/131437619.html#mitos+y+leyendas+cortas+de+la+paz+bolivia, is presented as content related to Bolivian myths and legends, likely to attract unsuspecting users. While no scripts were directly extracted, the PDF structure and extensive external linking strongly suggest an attempt to redirect users to potentially malicious or unwanted content, aligning with a spearphishing attachment vector.

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://lovingfarewells.info/uploads/1/3/1/4/131437619/131437619.html#mitos+y+leyendas+cortas+de+la+paz+bolivia
    • http://sloanebooks.com/uploads/1/3/0/4/130483678/126d436aee.pdf
    • http://ranchonuevoiaebi.com/uploads/1/3/0/8/130814441/3529632.pdf
    • http://musictheoryworksheet.com/uploads/1/3/0/6/130604560/pinojazapilewerir.pdf
    • http://prime-autocare.com/uploads/1/3/0/7/130775677/tipupopiviveten_wovaviwojer.pdf
    • http://tngca.org/uploads/1/3/1/3/131379612/lukisoze.pdf
    • http://thecosmiclobster.com/uploads/1/3/0/5/130541817/385573.pdf
    • http://purensimpleohio.com/uploads/1/3/0/5/130589044/suxunuzaz.pdf
    • http://bejustalittlebetter.com/uploads/1/3/1/4/131406541/mipixojim-xoruwe.pdf
    • http://nationroadhorserentalllc.com/uploads/1/3/0/2/130274146/8197168.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_off000070b4.bin
0a6862e4f04315b23e66485b7164b578ef4d8f070290dc42ecb39e140b229762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B4 9156 bytes

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