Malicious PDF — malware analysis report

Static analysis result for SHA-256 8386b5739c5bcb65…

MALICIOUS

PDF

35.5 KB Created: 2020-03-29 08:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 697ea81f626858fbc4300089c648f332 SHA-1: e97453cd84a30ed29aa47a63a67ea8bcce1c91ed SHA-256: 8386b5739c5bcb65cbc75fcdcf3d9e53318d01486c2259576205a0f318ca4cf5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body text is heavily obfuscated but contains references to URLs that are likely part of a link farm or a mechanism to distribute further malicious content.

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://theelfbox.com/uploads/1/3/0/5/130590008/130590008.html#notacion+cientifica+pdf+2+eso PDF link annotation
    • http://www.asminhasmudancas.com/uploads/1/3/0/4/130483772/fesusilit.pdfIn PDF document text
    • http://oneofakindbeauty.com/uploads/1/3/0/2/130288562/korem-suwifozekirepex-kexezedemoj-siwewulokedopo.pdfIn PDF document text
    • http://eliteleadsource.com/uploads/1/3/0/7/130775389/daravaz.pdfIn PDF document text
    • http://elysiumpastures.com/uploads/1/3/0/6/130640183/lovibulo.pdfIn PDF document text
    • http://crownfirearms.com/uploads/1/3/0/7/130739346/6697ca9.pdfIn PDF document text
    • http://vietthy.com/uploads/1/3/0/4/130476120/f93d997.pdfIn PDF document text
    • http://webdisk.rentholycity.madesimplydev.com/uploads/1/3/0/9/130969987/gikaxivuzetufetajoko.pdfIn PDF document text
    • http://petcarefxbg.com/uploads/1/3/0/4/130476684/datovanetarotekeza.pdfIn PDF document text
    • http://decibel-doo.com/uploads/1/3/0/6/130605270/3795866.pdfIn PDF document text
    • http://wrobelinrealestate.com/uploads/1/3/0/8/130815213/jesifalopadep_lupimeva.pdfIn PDF document text
    • http://spencer4orem.com/uploads/1/3/0/3/130324158/totadebuselaki_saravorepelu.pdfIn PDF document text
    • http://javieracortesmonroy.com/uploads/1/3/0/3/130379132/dajodewi-rimebapema.pdfIn PDF document text
    • http://kernersvillerentalhomes.com/uploads/1/3/0/4/130489066/kenopeludo.pdfIn PDF document text
    • http://kohicorgi.com/uploads/1/3/0/6/130604110/b78be9b04.pdfIn PDF document text
    • http://agilebreeding.com/uploads/1/3/0/8/130814205/wuvizeratajijapaw.pdfIn PDF document text
    • http://mercadopole.com/uploads/1/3/0/7/130775310/12b9994997.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A5 8352 bytes
SHA-256: 75016ed4cc68de13975c26b34fa67db723f722886babdb09390beeee326c3ef7