Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bb04b9ec814977…

MALICIOUS

PDF

51.1 KB Created: 2020-04-09 09:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 05d517b3f344db3dd0dfd61288fed36a SHA-1: e1c19f863245b5be2f9cd9f69378e51c85533457 SHA-256: 70bb04b9ec8149772bb3fd4691d3304f805612b85eec8671bffe26d4f84c45e3
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 link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to potentially harmful content, aligning with a spearphishing attachment vector.

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://jenniferkaood.com/uploads/1/3/1/4/131407687/131407687.html#significado+de+burocracia+segun+la+rae
    • http://10dayfilm.org/uploads/1/3/0/5/130551086/1372433.pdf
    • http://williamevertson.net/uploads/1/3/1/3/131398104/bb7894c6eac.pdf
    • http://swisshashtag.ch/uploads/1/3/0/6/130620275/66810.pdf
    • http://ramirezbrotherhousepainting.com/uploads/1/3/0/4/130435588/zuvumoxawe-fedapiwezu-powunom.pdf
    • http://alliancepropertypreservation.com/uploads/1/3/0/5/130589037/f17b71a010ea29.pdf
    • http://mycompanyapp.com.au/uploads/1/3/0/4/130491703/lemizamafobujuditulu.pdf
    • http://barnestaxidermy.com/uploads/1/3/0/6/130640142/aa9335fe.pdf
    • http://blazesocialmediamanagement.com/uploads/1/3/0/6/130639815/fd871ed965.pdf
    • http://hipdowntown.com/uploads/1/3/0/5/130588545/xulirogirimiso.pdf
    • http://wikkiwebs.com/uploads/1/3/0/5/130588407/f9ccd1b3b1d6.pdf
    • http://touringteachers.org/uploads/1/3/0/3/130313702/nosidujurunu.pdf
    • http://agelessfitness.net/uploads/1/3/0/4/130488483/dimav-dijuj-mukamesupak.pdf
    • http://gnosticsoftware.com/uploads/1/3/1/3/131380094/9285954.pdf
    • http://jd-cars.com/uploads/1/3/0/7/130775339/niloxedofina.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_off000076b3.bin
0fb4a4ff70bf586341cffa70b6341d95f3687b065892ec5585c68b73d67e7820
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B3 9660 bytes
font_01_sfnt_off00009903.bin
d74bf6d9e1cf32ddf5711059603e1d45b759be361ca1ba98242ab387e6260767
pdf-font-stream PDF embedded font (sfnt) at offset 0x9903 4132 bytes
font_02_sfnt_off0000a740.bin
55dafd8ce0f81202030d935a74b5597fbbfa8a6953de785617a5ad06fd0744ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xA740 16172 bytes