Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d3522eb0ee63bc…

MALICIOUS

PDF

71.1 KB Created: 2021-02-19 22:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 70a8e537a16c3eaeb09573b51b3c3a12 SHA-1: 018e84c30abe0eef3f92176eceac7b4956e8d600 SHA-256: d8d3522eb0ee63bc8a7cfa45ea456a885f38e2d86fa0956ae707e563ff33c4a1
66 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged as a link farm, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly suggests malicious intent, and the presence of external URIs points towards a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to a game, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://seumenha.ru/wix?keyword=5+nights+at+freddy%2527s+2+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5feb380234187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_602372e325909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_602ed207a17b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_601028aa3e09f.pdfIn PDF document text
    • http://chambrehq.xyz/vsphere_client_6._0_linkigvwm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470826/normal_5fde86e7cd7c8.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/0F3kXje/nexadoranuwujezazaxulabe.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/tkhjyjd/blinds_for_big_windows_living_room.pdfIn PDF document text
    • http://biggymstoe.com/ice_machine_for_knee_replacementxku8c.pdfIn PDF document text
    • http://bebolekuku.22web.org/bonobizexesekosi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414357/normal_5fecc0659a1f2.pdfIn PDF document text
    • http://rocketdocs.us/duredivaxejakidu0zrcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubixuguse.epizy.com/how_to_use_bluetooth_controller_on_dolphin_android.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 5632 bytes
SHA-256: 9fa5d387048f554db79e7910b270f2f3bb214bd199661bb5748e67747a85fb3d
font_01_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 10696 bytes
SHA-256: f4e04b90e0550b746132f505fc61b3ab3db6c229f06e806cd7201d61887634a4

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