Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c74b6621ee60fe3…

MALICIOUS

PDF

80.4 KB Created: 2021-03-08 19:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 065e9b270e2003de8e2517de6cc1cede SHA-1: d383f23a9822ec4811e4df38fe744fe0ad66e306 SHA-256: 4c74b6621ee60fe310efcc808753677d60a3366e6f176e549b4c718f6c51a61b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=what+emotion+does+orange+represent
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/nomoropojowad.pdf
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/7523027.pdf
    • https://cdn.sqhk.co/gukokefa/ghh2iir/nuxinewakejudesetope.pdf
    • https://cdn.sqhk.co/wufotubi/hib1jbb/16397368329.pdf
    • https://cdn.sqhk.co/lidupusumoj/hjdgdca/online_business_startup_checklist.pdf
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/279412f.pdf
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/danudazewagemapekit.pdf
    • https://vufofameti.weebly.com/uploads/1/3/0/8/130874118/3727275.pdf
    • https://cdn.sqhk.co/zoribakim/hagjpDi/shark_ion_robot_app-_controlled_robot_vacuum_rv761.pdf
    • https://cdn.sqhk.co/votijavos/Agcij2l/57985618422.pdf
    • https://xunilizavokuniz.weebly.com/uploads/1/3/6/0/136050149/denoku.pdf
    • https://lugexobamav.weebly.com/uploads/1/3/5/9/135965248/2657396.pdf
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/2438488.pdf
    • https://badikixokatapi.weebly.com/uploads/1/3/0/7/130739740/xekerepufivox.pdf
    • https://cdn.sqhk.co/dakuwuwuzije/gftGMOM/kiretunofagemaxebaseb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_d97d3637d1984838813106a6644d64d3.pdf?index=true
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_6f01ea5c787a466887f5f0eaf41df5f5.pdf?index=true
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_2d478565e3f74117bb8d792736e87cea.pdf?index=true
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_031b8b6c164f4856b5b15c27906f3b77.pdf?index=true
    • https://uploads.strikinglycdn.com/files/427e8137-deb2-4192-af54-07109c792586/how_many_chapters_in_the_trials_of_apollo_book_1.pdf
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_6bec9890c6774180bdf80640a66c5f80.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea269c26-4067-4a31-9081-3df9e09c4950/68644440068.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc4a.bin
e63c241dc07148de8055445c2cb30132805208d1c10e3ec56652c8a12d439f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 5356 bytes
font_01_sfnt_off00010e60.bin
316c0673acf8466f4f62c3779de6221742205e37939dd1d4c0e391c0ee5fe206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 11204 bytes

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