Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c9c92533e96a6f…

MALICIOUS

PDF

54.0 KB Created: 2020-04-08 12:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 790163cebb22acfbcc571428771a1532 SHA-1: 652e96dab43c48ac8bc4e544fed0a521aa161b19 SHA-256: 75c9c92533e96a6f23e1b8569a4a4998db4c19e838615e4fcc02567a3e627ae9
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted IOCs. The ML_NYX_PDF_MALICIOUS heuristic strongly suggests malicious intent, likely related to SEO manipulation or redirecting users to potentially harmful content hosted on the numerous external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jungkyookimkorea.com/uploads/1/3/0/3/130379634/130379634.html#partituras+para+guitarra+clasica+faciles
    • http://raglandgreenery.com/uploads/1/3/0/5/130540106/2fe469c7e.pdf
    • http://lipscombclothesline.org/uploads/1/3/0/7/130775821/nudawabel.pdf
    • http://dippindogs.org/uploads/1/3/1/0/131070525/5369210.pdf
    • http://lantimoine.com/uploads/1/3/0/4/130476378/6939179.pdf
    • http://renojunkremovalpros.com/uploads/1/3/1/3/131381881/3312756.pdf
    • http://1gospelofgod.com/uploads/1/3/0/5/130544089/af3680df2d7a1.pdf
    • http://chibuzorejimsart.com/uploads/1/3/1/4/131437677/norekemevovubite.pdf
    • http://sickontop.com/uploads/1/3/0/6/130620897/winasukexalebab_rorinipe_mevojumi.pdf
    • http://bjemdesigns.com/uploads/1/3/0/5/130543351/4843033.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663a.bin
a3f8ecadcc8634b2f7dc9baa772845305106631f17f15c664c6317235e1f66a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663A 9512 bytes
font_01_sfnt_off0000887a.bin
83d89f79375f7f339e88070a8779324ce221c94923bff415e388e162fbc46cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887A 2604 bytes
font_02_sfnt_off00009183.bin
ebfdc7812a5d9b4055995931ab191e4d8ce70fbfae00a1ea7d14dd8c3c818e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9183 5928 bytes
font_03_sfnt_off0000a487.bin
f6ff990806f26ec4d5220c5b9e741bb8f8491bf1c4c27d0b49698a1db55c46b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA487 1796 bytes
font_04_sfnt_off0000ad66.bin
6c60a16e76c2f0936c770f85381f3a45781e81eb9350e24eb85b052d35c044df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD66 17536 bytes

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