Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bad82fe48a3efb…

MALICIOUS

PDF

78.4 KB Created: 2021-03-12 21:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e5992b5a21e741ecd3e2d2f618d1832b SHA-1: 340fbb3f09c5d680d5f27e0b453f6be9752bc802 SHA-256: 99bad82fe48a3efbcfdec06a6daeb680140ebab0154a3b15c55d41ab3f9dbe5b
234 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to academic content, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://dafemum.ru/award?keyword=tesis+de+administracion+turistica+y+hotelera+pdf In PDF document text
    • https://rotemewan.weebly.com/uploads/1/3/1/3/131380756/kewawebo.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/dTjf8ic/77368613538.pdfIn PDF document text
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/ae8066d6bd4fd9.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/G2nhgie/kelewizidefulabe.pdfIn PDF document text
    • http://podozurika.22web.org/multiplication_arrays_worksheets_grade_2.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/3c93f9b.pdfIn PDF document text
    • http://rosotorejujuv.22web.org/68311086850.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/RC6gigi/xinonu.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/gZqs7f2/dabomimamunolupot.pdfIn PDF document text
    • https://foxewazijibaj.weebly.com/uploads/1/3/1/3/131379544/ripeme.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/177634.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/zicbghn/kodiak_bear_hunt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fegosuzix.epizy.com/los_42_nombres_de_dios_yehuda_berg.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/67664883432.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/free_splash_screen_images_for_android.pdfIn PDF document text
    • http://banumekopi.epizy.com/amoeba_sisters_characteristics_of_life.pdfIn PDF document text
    • http://xawosote.epizy.com/asatoma_sadgamaya_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/nukeraxulo.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/psd_template_for_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/resumen_del_libro_la_tregua_de_mario_benedetti.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/aaa_logo_design_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/eine_kleine_nachtmusik_piano_duet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/6407948673.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/73045896659.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/33282510513.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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5444 bytes
SHA-256: 509b59401cd48dd50847fa068e936bbb748ecf82ee886a6fb022fedb557ea477
font_01_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 11600 bytes
SHA-256: d0f894ec5f022cf29674bec6fb070a7db41b73812469aa48a43c806799dd3b96

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