Malicious PDF — malware analysis report

Static analysis result for SHA-256 d738ace78187ca0d…

MALICIOUS

PDF

118.7 KB Created: 2020-04-05 03:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2a5704f95530ac5cd8f49daa5261e4a9 SHA-1: 796ddf3bc6ef836c731a65781c49fb09db157b85 SHA-256: d738ace78187ca0dd22b853c94f42282195933d9a51fb37a40c3b1472104fc20
96 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection mechanism. The embedded URL 'http://wanderlust-ae.com/uploads/1/3/1/1/131163514/131163514.html#segunda+guerra+mundial+paises+aliados+y+del+eje' is a primary indicator of this activity. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wanderlust-ae.com/uploads/1/3/1/1/131163514/131163514.html#segunda+guerra+mundial+paises+aliados+y+del+eje
    • http://lachinetruckrepair.com/uploads/1/3/0/5/130590200/modutufefuxiruluj.pdf
    • http://michaelkenny.ie/uploads/1/3/0/7/130776148/bojenepurewazorosug.pdf
    • http://cvaccreditation.com/uploads/1/3/0/5/130588784/lirakezixojejelotote.pdf
    • http://disabilitymanagmentsolutions.ca/uploads/1/3/0/6/130605471/magevurifigixalap.pdf
    • http://haskellassociates.com/uploads/1/3/1/3/131398563/8aa15.pdf
    • http://rgvelectrical.us/uploads/1/3/0/4/130435783/6497844.pdf
    • http://blackmonmarshall.com/uploads/1/3/0/6/130604815/madoruxiwomevapixusu.pdf
    • http://wildernessfamilies.org/uploads/1/3/0/7/130739170/7a43fd09977.pdf
    • http://un-mariage-a-la-reunion.fr/uploads/1/3/1/0/131069806/fopapobozusufud.pdf
    • http://viperfisharts.org/uploads/1/3/0/7/130775334/kevor.pdf
    • http://thedocumentarychannel.com/uploads/1/3/0/3/130323513/munatojetidejiv.pdf
    • http://strange-productions.com/uploads/1/3/1/0/131070301/muluzafa.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016679.bin
3ddb4efad7cddd26846e7a888d343ee3d6e3a3c7275bad2e640d1d39aff2d1c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x16679 11772 bytes
font_01_sfnt_off00018c2b.bin
2696266ca455e2570ded942d6c93115206db6e4b6aae25b2b6b2091dc1e0262d
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C2B 9524 bytes
font_02_sfnt_off0001aaaf.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAAF 2652 bytes
font_03_sfnt_off0001b416.bin
b515d499488cfd093d45aec826e6d80db630f321eaacc8756533d903116db9fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B416 16144 bytes