Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fed4f259612f3e3…

MALICIOUS

PDF

46.6 KB Created: 2020-03-08 12:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-05-15
MD5: affecc1443063371a03dc834cb84e57d SHA-1: 02ffcb9584d5c8cd7ca8ddd44ef558f333f4c38e SHA-256: 2fed4f259612f3e37c24eb3ddb40ce3e1cd6071a311701b47a4a1f75b6063159
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable binary data, but the presence of numerous URLs is the primary indicator of malicious intent.

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://test.ladse.org/uploads/1/3/0/6/130604856/130604856.html#latar+belakang+makalah+demokrasi+dan+pendidikan+demokrasi PDF link annotation
    • http://rogersbellappleiphonereadreceiptssamsung.com/uploads/1/3/0/6/130603855/wozuxolurumepuvu.pdfIn PDF document text
    • http://dnmlr.com/uploads/1/3/0/2/130289226/72753d7b0.pdfIn PDF document text
    • http://allabouthomerecording.com/uploads/1/3/0/5/130539936/4819619.pdfIn PDF document text
    • http://www.leslieorvik.com/uploads/1/3/0/8/130874011/5175405.pdfIn PDF document text
    • http://northeastflowershop.com/uploads/1/3/0/3/130312971/3213515.pdfIn PDF document text
    • http://www.pandachems.com/uploads/1/3/0/7/130740617/wixebafuxolimi_guwafexubef_jofaveg.pdfIn PDF document text
    • http://pxrministries.org/uploads/1/3/0/5/130588360/rokibemusanewewej.pdfIn PDF document text
    • http://morrisseauartist.com/uploads/1/3/0/4/130477541/fb57a043f78.pdfIn PDF document text
    • http://hostmaster.jacksonandhow.co.uk/uploads/1/3/0/7/130776790/24c46.pdfIn PDF document text
    • http://astro-video.com/uploads/1/3/0/6/130604117/f4dc791b1a96.pdfIn PDF document text
    • http://solairforce.net/uploads/1/3/0/4/130489226/vonebije.pdfIn PDF document text
    • http://massageforthemasses.com/uploads/1/3/0/5/130588417/xiwatiker.pdfIn PDF document text
    • http://www.kaneconsultants.net/uploads/1/3/0/5/130545573/ramasisiwunemi.pdfIn PDF document text
    • http://naturalorganicbeautyhealth.org/uploads/1/3/0/9/130969624/sufijuwubulini_zirojozala_sinazotaxulune.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79D0 7472 bytes
SHA-256: ce892ea1b8e446ea372309f02efe27e42069efa421dd54eb9bd39476a6955229
font_01_sfnt_off00009719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9719 16204 bytes
SHA-256: f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d

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