Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f207cc7cb7ebca7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 11:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 6e5391926f7a9ad91e652ba9b71e8265 SHA-1: 2d3a609494c611481ead660e2158545f041b88b5 SHA-256: 7f207cc7cb7ebca7cf3e9a225f7a37d4445c06ad8aa56e2e27aff379e5775b57
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to redirect users to potentially malicious websites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://costabravas.com/uploads/localidades/files/4756722945.pdf In PDF document text
    • http://tao-oita.com/admin/upload_filesfile/piled.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/towowol.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/misamesemefafefenewuziwej.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/32624707862.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/69138164477.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/jogepanitawugo.pdfIn PDF document text
    • http://amandamaitland.com/images/file/71604500510.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/36290865597.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/gutoropapozewuvati.pdfIn PDF document text
    • http://telecycling.org/files/file/tatiwirovegiduse.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/bitariku.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/roxoxipevo.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/zujubigipi.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/renuzedakufenuzikuku.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/lutakakekixilunutipapuja.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/77254809778.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/fadugedanewu.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/49257014253.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/tatokikalivotisir.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210912/file/gowexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+unlock+an+old+phonePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 18088 bytes
SHA-256: 590b6f8009a735a5489bfa06999c235c11e1e08a8b1943962d4444163c0f345c
font_02_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 10520 bytes
SHA-256: caff1700121af4b4145b663827b6810caf98baec05a9a72bac6abd6a2c66bffb

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