Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cca05950af61321…

MALICIOUS

PDF

48.3 KB Created: 2020-04-29 22:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bac44c0f8b66f0ff30231d337322bfac SHA-1: 1f1a6d6faa3a8814b28cc8bf20ca5d6cf80b3858 SHA-256: 5cca05950af61321b714b535fdca1f849add8fea1b5da3d3ead27cba8f1fa9ba
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains numerous external links, suggesting it is part of a link farm designed to distribute malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs users to disable security software, a common tactic to facilitate further compromise. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://all4youtravel.net/uploads/1/3/0/9/130969042/130969042.html#windows+10+home+bagas31
    • http://ailearning.services/uploads/1/3/0/3/130379305/bijoxaliboxolikanuza.pdf
    • http://dragonflyaerosolutions.net/uploads/1/3/0/7/130776015/dubufodawowe.pdf
    • http://jbkac.org/uploads/1/3/0/8/130873978/nuluzep.pdf
    • http://estebanmarino.com/uploads/1/3/0/4/130488888/kapoxogarojan.pdf
    • http://hazelspianobook.com/uploads/1/3/0/6/130620340/46f0ad68915db.pdf
    • http://frackfreefoothills.org/uploads/1/3/1/6/131606343/5204289.pdf
    • http://le-manuel-des-entretiens-de-motivation.fr/uploads/1/3/1/4/131413222/sosur.pdf
    • http://bigfrogclairemont.com/uploads/1/3/0/7/130776483/rodopofituromu.pdf
    • http://annamatchey.com/uploads/1/3/0/6/130605186/1aa66b.pdf
    • http://suffolksboldesthockey.org/uploads/1/3/0/2/130287799/bigusomumim.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://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_off00008022.bin
355875b4af399b3eccc55eb139a0bd5e66b56fffeb714c27cd93d33362a347e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8022 8180 bytes
font_01_sfnt_off00009fac.bin
32b54217619f9438721b423dc2f4f4da0f78781b0811ea49af2be6b0310ecf56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FAC 16164 bytes

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