Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4056f76a953e5b1…

MALICIOUS

PDF

33.7 KB Created: 2020-06-04 02:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d6defc606bd634cfe9f0ca877f2ec2d SHA-1: b74105c9aaa9d5dc12c5e9dad56d664f71672359 SHA-256: f4056f76a953e5b12cbc3e8284f882cae4474395da0026c1755dd09c6663c6b5
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though malformed, contains text related to '13 colonies map printable labeled' and references the wkhtmltopdf tool, suggesting a lure document. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to numerous external URLs, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://hostmaster.hollismeadorganicdairy.co.uk/uploads/1/3/1/6/131636692/131636692.html#13+colonies+map+printable+labeled
    • http://ajmemorialevent.org/uploads/1/3/1/6/131606175/1526801.pdf
    • http://columbusmusicschools.com/uploads/1/3/2/3/132302941/c79c6440fc135c.pdf
    • http://cansolvest.com/uploads/1/3/0/7/130776891/4142408.pdf
    • http://theforceoftruthministries.com/uploads/1/3/1/3/131379183/runonuboja-fegejatizapi-vimobugerinov-lesinedanom.pdf
    • http://boilerbustersri.com/uploads/1/3/1/0/131070377/xuvexotukafato.pdf
    • http://hostmaster.londonimagingnetwork.com/uploads/1/3/1/3/131380870/tiwadirefikaj-xidegebaronekal.pdf
    • http://mozarts.shop/uploads/1/3/1/4/131408131/lurawilatu.pdf
    • http://claimlostfunds.com/uploads/1/3/0/5/130551249/dolaratigurep-falijene-rexaxibo.pdf
    • http://hostmaster.hollismeadorganicdairy.co.uk/uploads/1/3/1/6/131636692/terms.html
    • http://hostmaster.hollismeadorganicdairy.co.uk/uploads/1/3/1/6/131636692/dmca.html
    • http://hostmaster.hollismeadorganicdairy.co.uk/uploads/1/3/1/6/131636692/policy.html
    • https://zulexalo.files.wordpress.com/2020/06/17428710275.pdf
    • https://rutogusufem.files.wordpress.com/2020/06/zavadinukorat.pdf
    • https://susixomu.files.wordpress.com/2020/06/31153640931.pdf
    • https://dikajawu.files.wordpress.com/2020/06/72334399844.pdf
    • https://duzawexosusa.files.wordpress.com/2020/06/zorif.pdf
    • https://rilamexix970799637.files.wordpress.com/2020/06/vujajiwumaxom.pdf
    • https://vuxosukaj.files.wordpress.com/2020/06/zakokokenunimotinosefu.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_off000058c1.bin
dfed63545bd629efccf4f78777fe1d35bd605f42d1f2d06644557a2837c9eb87
pdf-font-stream PDF embedded font (sfnt) at offset 0x58C1 10032 bytes