Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8e23825f3cb584…

MALICIOUS

PDF

79.3 KB Created: 2021-04-26 18:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aa7d9c27e231d00407c11c2c59712521 SHA-1: 4eec37736dd01c9a62c170b7ea3d2e69db878958 SHA-256: fd8e23825f3cb5841fd37201c92649346d12006b35c5cd90cd81256e1eebb24f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicative of a link farm or phishing lure. The primary malicious URL identified is 'https://jacksth.ru/strik'. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_URI' strongly suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=steps+of+service+learning PDF link annotation
    • https://bizuzekibokosu.weebly.com/uploads/1/3/4/4/134446479/xaxafosu-wuwuzemafe.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/d5cc8ed15fea.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/2515991.pdfIn PDF document text
    • http://zedateve.mypressonline.com/joseph_schumpeter_capitalism_socialism_and_democracy.pdfIn PDF document text
    • https://fozapiko.weebly.com/uploads/1/3/0/9/130968993/5193256.pdfIn PDF document text
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/vidolonatijo.pdfIn PDF document text
    • https://fewifaki.weebly.com/uploads/1/3/4/5/134578400/vewifakeber_bukor_wepegabaxi.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/accuphase_e470.pdfIn PDF document text
    • https://nipukidifa.weebly.com/uploads/1/3/0/8/130873732/palokexasu.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/joraxuluda_riwetulebivujip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/iq_online_test_with_answers.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/ekonomi_neoliberalisme.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/tobesuzuxuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536713f5-d343-47a0-8b8b-25c0c5db10e0/south_indian_food_menu_list_non_veg.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/wukozizomibubuwonebuxoval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d7f281-7177-47c7-be55-359bc342d6c5/the_vampire_diaries_books_or_tv_show.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/36429860347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/844691e8-9b59-460a-9dcf-27ed89d2133d/58523374209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd7fa9e-ca4f-479d-a08a-98f334c234e3/voxapakilivemazox.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/51155795730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac93315-ebdc-4802-913c-8b06badacdaf/free_downloadable_quick_study_guides.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_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 5344 bytes
SHA-256: bdb9592c34f8d568fcbaa0ee5c69dc50b3ffda4a30a56db20c5222696df24ac4
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 11016 bytes
SHA-256: 3be3c95711b463e918b84fe5755f60e6ca9c4432491990c9275d7c455056966e

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