Malicious PDF — malware analysis report

Static analysis result for SHA-256 af72c8eba06abbe7…

MALICIOUS

PDF

66.4 KB Created: 2021-03-20 11:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee9272d689a81844455e42810c69878f SHA-1: 5bbef01452abeb88b3800307d7fc07624dfab425 SHA-256: af72c8eba06abbe7174c28d78a52b21a365b3078381ec7be392841cc21f56bf5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=antigone+final+test+review+answers
    • https://nilizexuv.weebly.com/uploads/1/3/0/7/130739046/sirekepebuponilu.pdf
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/sosapofuva.pdf
    • https://makojinoguj.weebly.com/uploads/1/3/1/4/131406607/6c7abd36.pdf
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/8010055.pdf
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/00f343baea7a7.pdf
    • https://lijarodamuvoraj.weebly.com/uploads/1/3/4/4/134456910/tavadowiden.pdf
    • http://fiteduwad.22web.org/zejobonosuvab.pdf
    • http://lastmarkt.ru/937463786377gfmh.pdf
    • http://stopnutristrike.ru/lyrics_video_status_download_punjabi_sharechatz3pi9.pdf
    • https://rogubadivuna.weebly.com/uploads/1/3/4/3/134337887/1649085.pdf
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/zimokinuwapesit.pdf
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/lewasoro.pdf
    • http://stebsmeh.space/14676930823d72xc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lurosanonit.epizy.com/subject_verb_agreement_worksheet_for_grade_4.pdf
    • https://s3.amazonaws.com/wazorixekunafob/malayalam_bible_free_for_iphone.pdf
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_0b20dcd8c6864dac8222a127c14e4b99.pdf?index=true
    • https://s3.amazonaws.com/zopenave/16080446273.pdf
    • https://s3.amazonaws.com/pafiganovavi/firefox_offline_installer_free.pdf
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_f9d783113e474e16bd067840d7378ec7.pdf?index=true
    • 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_off0000c764.bin
4e07e5c18214c10d2e509db6889941be621964c20337da0ed91688d1076fb1b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 5076 bytes
font_01_sfnt_off0000d8d3.bin
a6dad6102ffc2a904f295e3b66330e08b17cad8a771e50c131202c047a747ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 10516 bytes

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