Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dd66b5ca1176c2…

MALICIOUS

PDF

45.1 KB Created: 2020-06-08 05:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dbaa71437f55615cfa0e26e0aef6b75 SHA-1: 4d89b0079af0071f74e1a0a97e1348216c76920c SHA-256: 05dd66b5ca1176c27ff489dcd4c383253e1f28c3112341b0a492dad3a34b7728
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to drive traffic to various websites. The document body, though heavily obfuscated, contains a reference to 'Heeso somali ah youtube' and the authoring application 'wkhtmltopdf', indicating a potential lure for users interested in media content. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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://3577productions.com/uploads/1/3/1/3/131382693/131382693.html#heeso+somali+ah+youtube
    • http://governmentwholesale.net/uploads/1/3/0/6/130620213/loxapulefolilib_kafujujibevid.pdf
    • http://buddhababes.net/uploads/1/3/0/5/130551106/zemosilarurire.pdf
    • http://precisionscreens.org/uploads/1/3/0/6/130621664/vamozuzuwakaga.pdf
    • http://subtoll.com/uploads/1/3/1/8/131871414/ledopugomupu-lenujibowexet-goxul-fefarovizile.pdf
    • http://webdisk.triangleyogabliss.com/uploads/1/3/0/4/130483230/268824.pdf
    • http://scadvocates.net/uploads/1/3/1/3/131384340/3667384.pdf
    • http://hawksleycourt.myhackney.org/uploads/1/3/1/6/131606624/rojexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://miguxosadep535525329.files.wordpress.com/2020/06/xadaxinekuzazu.pdf
    • https://buparogemi.files.wordpress.com/2020/06/wuzilerumaxoza.pdf
    • https://letuginiwufo.files.wordpress.com/2020/06/dugabopabe.pdf
    • https://juwojoxado89904707.files.wordpress.com/2020/06/jikuxomisoviwumanunixefi.pdf
    • https://zezupid.files.wordpress.com/2020/06/31778364152.pdf
    • https://regaxunizi.files.wordpress.com/2020/06/tidasij.pdf
    • https://jigatize.files.wordpress.com/2020/06/69206330076.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eae.bin
ea217daf67b40abb80fb21ba1051022e7143cb1f962e52a28f77b17623bbe1a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAE 10748 bytes
font_01_sfnt_off00009391.bin
29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146
pdf-font-stream PDF embedded font (sfnt) at offset 0x9391 16132 bytes