Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3fc35478b1b57c…

MALICIOUS

PDF

49.2 KB Created: 2020-03-07 20:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed3ca20cd98c711f27df422d21ee1996 SHA-1: a9efaf88f10a683b2d911e1168924f761d5a6394 SHA-256: 5a3fc35478b1b57cd12b309e7f1f5903b8cdfb43c31d5291f305cee9faaeb194
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or a mechanism to distribute additional malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://host15.pleasingfood.com/uploads/1/3/0/6/130604002/130604002.html#akuntansi+biaya+carter+pdf
    • http://organicdirt.net/uploads/1/3/0/4/130489144/gesigi.pdf
    • http://limitlesslawnsprinklers.com/uploads/1/3/0/4/130476940/22bfd1.pdf
    • http://towingsanantonio.net/uploads/1/3/0/5/130588435/655177c1c20fd4.pdf
    • http://www.keiokatsale.com/uploads/1/3/0/6/130604590/gejaw.pdf
    • http://www.webmail.northbristolsuscom.org/uploads/1/3/0/2/130289485/5d942eb2a7cd0b.pdf
    • http://woolerneighbourhoodplan.org/uploads/1/3/0/3/130313090/d6dc8aadd41.pdf
    • http://wakeforestfarmersmarket.org/uploads/1/3/0/7/130739175/1cf15a6a13a60.pdf
    • http://mail.kathymanners.com/uploads/1/3/0/7/130739373/c6e78b64.pdf
    • http://mormonhistoricalsites.com/uploads/1/3/0/7/130739793/biziwupukut-vagalokavimazak-jefiziluriwila.pdf
    • http://www.brunmartidytan.info/uploads/1/3/0/3/130313612/8781299.pdf
    • http://www.letsbreakbarriers.com/uploads/1/3/0/7/130740087/pamusidugewala_deworog_sowonidukusap.pdf
    • http://imagecenterspa.com/uploads/1/3/0/7/130774972/vijure_sovibagi_gumiluxurapuxav_kuvelugivamud.pdf
    • http://tryshashby-rolls.com/uploads/1/3/0/4/130436139/1a084b.pdf
    • http://nhsilbert.net/uploads/1/3/0/6/130604279/maxawemokad.pdf
    • http://jayprocess.com/uploads/1/3/0/7/130775280/f1ddc.pdf
    • http://manoliskaratarakis.website/uploads/1/3/0/5/130588710/1243453.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_off00007fcb.bin
fc884d58e7bd7b090d6e0b08bb5b7e1326bc43092ca5a60bd933b4669c50a87b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCB 9164 bytes
font_01_sfnt_off0000a2bd.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2BD 16036 bytes