Malicious PDF — malware analysis report

Static analysis result for SHA-256 713da840e6a34763…

MALICIOUS

PDF

40.8 KB Created: 2020-04-07 08:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3c04e8991b4d14dfaed43f9ccc7dabec SHA-1: 6b8be965f8d4f83c454009c47a53610351a8bf89 SHA-256: 713da840e6a34763bd944a5385945af968aab6e3722d4f4af9a07788fe48f149
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown URLs supports this. No scripts were extracted, but the structure itself is suspicious.

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://doublemranchminiatures.com/uploads/1/3/0/2/130272548/130272548.html#teorema+del+sandwich+sucesiones
    • http://myinspiredliving.org/uploads/1/3/0/5/130539125/79c1cb2.pdf
    • http://facetofacepolebat.com/uploads/1/3/0/7/130740017/vubadenuxejopafofufu.pdf
    • http://afrahroyal.de/uploads/1/3/0/7/130739287/vipavu-xuninezalisezo-sujokoti.pdf
    • http://jorvikprorodeoassc.com/uploads/1/3/0/3/130323156/donepudaruga.pdf
    • http://sicpsycles.com/uploads/1/3/0/9/130969738/lubajirubinev.pdf
    • http://aftermarketupgrades.org/uploads/1/3/0/2/130288729/fidibufubudo.pdf
    • http://grazrootzskatefest.com/uploads/1/3/0/5/130542831/ccc5c70a05da5d.pdf
    • http://ancientcraftstudio.com/uploads/1/3/0/6/130604401/fatalovejulat-tazewewudugar-rulenutikak-nuruwox.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://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_off0000540a.bin
bbb3a299f36958ab081f161405b780c93f33f2031e5d14adaa5398325d47d903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x540A 7816 bytes
font_01_sfnt_off0000715f.bin
22358fa90b8337b4319074707fbf160d2ea6eb2b09a6b5269820a08ff0d4c897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715F 3392 bytes
font_02_sfnt_off00007d42.bin
c99c5f051bfd35f74e57eace24d8efbb6c3664e89dec04bb0c75d2b41d243612		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D42 16520 bytes

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