Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4037fa4fe35796…

MALICIOUS

PDF

71.1 KB Created: 2021-02-23 04:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e4b349658de6091cef0ce951c66c8e01 SHA-1: d16eb18461a8ddf57bd07788ef51147991df9386 SHA-256: cd4037fa4fe35796b33bac78faa35c065604cdda09794f792e4ef6cec484506f
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=rise+of+kings+troop+guide PDF link annotation
    • https://cdn.sqhk.co/mojupesonon/8hahhif/4758781124.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/wugugimo_zorafo_tikutopobonotu_denijotoxejik.pdfIn PDF document text
    • http://viputixezererej.66ghz.com/u_k_ka_full_form.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/jikelog.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/4393384.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/hf9ifrf/nenaxepipi.pdfIn PDF document text
    • http://zakovekapi.22web.org/dont_care_lyrics_khan_bhaini.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/bexetebi-disatidegixori-xuzoleser.pdfIn PDF document text
    • https://wexivupesowapab.weebly.com/uploads/1/3/2/7/132712225/muparosoz.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/aedd2c9fec3e92.pdfIn PDF document text
    • https://javubabajekav.weebly.com/uploads/1/3/5/9/135957287/lurexetaz.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/6ZoQQBy/benifinoxigad.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/jodoxoxikotabut.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/vcicibF/fazasovexotikipajuxe.pdfIn PDF document text
    • https://dulijijinigukal.weebly.com/uploads/1/3/5/2/135297200/42af72243904.pdfIn PDF document text
    • https://jijixedo.weebly.com/uploads/1/3/1/3/131398351/nadujuxeluruso_zowobulog_vomuxitelilem_vewugitilebaxu.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/rokudadaripubub_supixavabifupij_wojafipaliluduj.pdfIn PDF document text
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/fekiwipokavij_fixaxaziw_ruzebuza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redilupabisaxo.rf.gd/college_transfer_application_letter_format.pdfIn PDF document text
    • http://gukewaxubi.epizy.com/just_shapes_and_beats_igg.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_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 5036 bytes
SHA-256: 017e5b383d84af29876eab19cc8fc45dcce30748ee61ca2c3ade341d4132396d
font_01_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 9792 bytes
SHA-256: c99b3688f528d95d5c274a7e7c35b9cd287b9b0e7595b4a1cfee6e2690c002ef

Open this report in the interactive analyzer, or submit your own file for analysis.