Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7e6fc80fd2bf20…

MALICIOUS

PDF

58.4 KB Created: 2020-03-26 14:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7a85cd6911b57b7aa58f1b5ec0c913c1 SHA-1: 08ad1c774efc34caac9a01c8941c40ceba03787a SHA-256: 6f7e6fc80fd2bf20505cc751ba13b3bea816e062db7e3e00f4a417cf178dcd01
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains URLs that are also present in the list of extracted URLs. This suggests the primary purpose is to direct users to a network of websites, likely for SEO manipulation or to serve as a landing page for further malicious activity. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://whyhdeverything.com/uploads/1/3/0/8/130874422/130874422.html#reading+comprehension+assessment+free+printable
    • http://xowf.com/uploads/1/3/0/2/130289546/3598126.pdf
    • http://annalisaunkuri.com/uploads/1/3/0/7/130738955/3873468.pdf
    • http://mejoramalaga.com/uploads/1/3/0/2/130287939/b8be328.pdf
    • http://patriziocontemporary.com/uploads/1/3/0/5/130544584/6872214.pdf
    • http://goradiocristosalva.org/uploads/1/3/0/6/130604703/piruket_tojanogevesi.pdf
    • http://knownothingmom.com/uploads/1/3/0/7/130738487/226b0af4bd.pdf
    • http://madelynbloom.com/uploads/1/3/1/1/131163631/a51daf4bd1e9f.pdf
    • http://candicemoss.com/uploads/1/3/0/5/130588419/mibujomawakazup-zidujavazenuj-wenidi.pdf
    • http://www.thebarigray.com/uploads/1/3/0/4/130436180/votuzejiwixofosupun.pdf
    • http://billandtonis.com.au/uploads/1/3/0/9/130969313/nekitufogefi.pdf
    • http://art2artexhibitions.com/uploads/1/3/0/4/130488304/baroxejawe-sexuwokaxiludup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009aa6.bin
537fff2cf69cdd7c2b3cf189e824edf5c7d454d19b9186ace906dd4b24f74502
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA6 9204 bytes
font_01_sfnt_off0000bd7a.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 1708 bytes
font_02_sfnt_off0000c5e1.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E1 16204 bytes