Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a130f522402b02f…

MALICIOUS

PDF

52.4 KB Created: 2020-04-21 15:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 321c0466fc9d69eb93d18e3fa6db48c1 SHA-1: bae82da77ee11324ce9b03da9912eaa29b22e6bb SHA-256: 0a130f522402b02fe5166cde3f46dbd5ebeaa10057878f96d08988244f27c6e2
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous external URLs indicates a potential for hosting malicious content or further redirection. The document body contains garbled text and what appears to be metadata from the authoring application.

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://forgefactorygym.com/uploads/1/3/1/0/131070131/131070131.html#osrs+quest+exp+guide
    • http://phoebenewling.com/uploads/1/3/0/9/130969278/dotipetap-fadezulabo-zumotumevanowix.pdf
    • http://zjscreations.net/uploads/1/3/0/6/130604375/4d6c3a66.pdf
    • http://attritionphysicians.com/uploads/1/3/1/3/131383305/5810514.pdf
    • http://tasinnovationlab.com/uploads/1/3/0/6/130603884/wimoxesik.pdf
    • http://dtouhylaw.com/uploads/1/3/1/3/131379320/teniga-daxodadiv-konojinozurexe.pdf
    • http://mylifehealthchart.com/uploads/1/3/0/6/130640061/715a0e22afd.pdf
    • http://thebakerstualatin.com/uploads/1/3/1/0/131071113/dibabopa.pdf
    • http://c5events.ca/uploads/1/3/1/6/131636629/bapafototusiton.pdf
    • http://lesentreprises.net/uploads/1/3/0/6/130605420/rinobuxete.pdf
    • http://facesofcovid-19.com/uploads/1/3/0/7/130739131/nirega.pdf
    • http://kathybrownmusic.com/uploads/1/3/0/6/130621527/zuzoxosefor_lezibujotol_mafepulizezuzu_jekaxiziguk.pdf
    • http://susanpultman.com/uploads/1/3/0/6/130620274/5945883.pdf
    • http://latimerj.com/uploads/1/3/1/4/131483632/236470.pdf
    • http://techteamsix.net/uploads/1/3/0/2/130289290/rilaxopade_xurebagoserem_ramepu_timazex.pdf
    • http://bunnylovesgarden.com/uploads/1/3/0/7/130740033/jizurifin_mipiloxo_joxituxuvi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b55.bin
0919f034ebaeb55ed2cfa229798af54cfc2366408a135edd9c661854eb3044a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B55 8388 bytes
font_01_sfnt_off0000bb8c.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8C 2652 bytes