Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8082fd8af25a30…

MALICIOUS

PDF

34.4 KB Created: 2020-04-01 19:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1bf75a85ad2e1cd231a528465cac4299 SHA-1: 55549d6d928d76a85b4215bf84fb98f99f338c5e SHA-256: fd8082fd8af25a306b931ce1753d9e7ba06d31a1d63f83e73b04811f1592d9e7
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. The ML classifier strongly indicated maliciousness. The primary attack pattern appears to be the creation of a link farm, likely for SEO manipulation or to distribute further malicious content through the linked PDFs.

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://sassyfrassboutique.org/uploads/1/3/1/4/131408229/131408229.html#bomba+hidraulica+engranajes+bosch
    • http://choiradmin.com/uploads/1/3/0/5/130545565/juduvi.pdf
    • http://kivahco.com/uploads/1/3/0/8/130873758/4023665.pdf
    • http://joybeautyblog.com/uploads/1/3/0/7/130740145/soxozijal.pdf
    • http://thereignbowlife.com/uploads/1/3/0/6/130604078/werezokokikared.pdf
    • http://vazquezm.org/uploads/1/3/0/5/130588547/df61d0e84fc0d.pdf
    • http://traveloversconcierge.com/uploads/1/3/0/5/130588513/b63932161bdc.pdf
    • http://mainesigns.com/uploads/1/3/0/7/130739624/43923cf.pdf
    • http://techconnectwest.net/uploads/1/3/1/4/131406861/saxeko_tuworike_zopefo_gariradagupo.pdf
    • http://menonlyadventures.com/uploads/1/3/0/5/130589268/3183757.pdf
    • http://sarahsteffan.com/uploads/1/3/0/6/130621832/nagemuz_loxubudujug.pdf
    • http://the-sustainables.org/uploads/1/3/1/0/131070334/e5b39015cbef.pdf
    • http://ballintoberphotos.com/uploads/1/3/0/7/130739764/supexewegimav-watuxibusoduf.pdf
    • http://natureinnny.org/uploads/1/3/0/5/130539553/bewiwozezid_fajosut.pdf
    • http://cameronattee.com/uploads/1/3/0/9/130969169/2402970.pdf
    • http://western-union-nhantien-vn.online/uploads/1/3/0/7/130739583/pijuwezi.pdf
    • http://sucre.de/uploads/1/3/0/6/130620767/sogadabifijag.pdf
    • http://ns2.grassrootscf.org/uploads/1/3/1/4/131438012/ziwij_bavomujoferulo_zepakorukowo_penokologik.pdf
    • http://cardifftrailertransport.com/uploads/1/3/0/3/130379803/sibojelu.pdf
    • http://happylifecounselling.com/uploads/1/3/0/2/130270897/25f57.pdf
    • http://incantesimidamore.com/uploads/1/3/0/6/130621832/9599be.pdf
    • http://webridgethegap.org/uploads/1/3/0/6/130604368/zijijowera-xepife.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005def.bin
9c73d56350e3544d870f028d9eb756d727ab2e911552e5094c336c5a5ca34972
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEF 8028 bytes