Malicious PDF — malware analysis report

Static analysis result for SHA-256 607f039800d15695…

MALICIOUS

PDF

52.0 KB Created: 2020-04-11 01:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bbb4074483bea3c0973182a74f48e1ac SHA-1: 4a6722ec18f3c869f1d0986744c7e012214c5790 SHA-256: 607f039800d15695918c54b0ca5ee13c4ea1987d1344dbdc80ac5e5b15241d82
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host other PDF files, indicating a link farm or redirection scheme. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'Comptia A+ practice test'. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links supports a malicious intent, likely to lead users to malicious content or phishing pages.

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://northernrailleaders.com/uploads/1/3/0/6/130605380/130605380.html#comptia+a+practice+test
    • http://earthworksenvironmental.net/uploads/1/3/0/4/130477605/lolanepapobamanojim.pdf
    • http://royalglow.net/uploads/1/3/0/5/130551374/divow-miwawubu-moxekasebenafa.pdf
    • http://buyorsellyours.com/uploads/1/3/0/8/130814851/1fa6b64.pdf
    • http://belmarbookcon.com/uploads/1/3/1/4/131453114/ruxajazil.pdf
    • http://shengyingjianying.com/uploads/1/3/0/2/130273790/ranari.pdf
    • http://thunderontheriver.com/uploads/1/3/0/5/130551971/9758451.pdf
    • http://marthas-manor.com/uploads/1/3/0/5/130550925/7406057.pdf
    • http://3angelsmessageministry.com/uploads/1/3/0/5/130551303/5af3134.pdf
    • http://ivy-league.net/uploads/1/3/1/4/131437294/c865dff3bb64.pdf
    • http://therefugevbc.com/uploads/1/3/1/4/131453867/punubuzi.pdf
    • http://limpiezas.org/uploads/1/3/0/9/130969705/jesilesujakefanef.pdf
    • http://joanembry.com/uploads/1/3/1/4/131438876/vomozatit.pdf
    • http://drapesmith.com/uploads/1/3/0/6/130639608/zituzukuvikuxogadasa.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_off00008e82.bin
57f26163b19657da0c24d9186bb8b5ba8d40ad987616ba2c0ffeb9524e3c8af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E82 8352 bytes
font_01_sfnt_off0000ae9a.bin
45c39c4315a5d00962143d4102937301eb2649728d6de39b959633cfc30365c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9A 16144 bytes

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