Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e542db1ddfac5d1…

MALICIOUS

PDF

77.8 KB Created: 2021-04-02 03:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 586865129c9ab616b51c8229790db36f SHA-1: e846c9d0f8edd2df70583aa7f6edf4cf9d8308b9 SHA-256: 8e542db1ddfac5d1aff06cab346a515cd85ff93569fb55b650c801064caeb7a9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm or SEO spam campaign. The primary malicious URL identified is vilenefex.ru, which is likely used to host phishing content or further malware. No scripts were extracted, but the PDF structure and numerous external links suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=concepto+biodegradable+pdf PDF link annotation
    • http://gubixazolela.sportsontheweb.net/veradibutira.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/9102678.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/vejefa.pdfIn PDF document text
    • https://betewobinolatid.weebly.com/uploads/1/3/4/7/134756009/9945471.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/jogukenakuvaz.pdfIn PDF document text
    • https://zewijevatijafat.weebly.com/uploads/1/3/4/2/134265582/muvewud.pdfIn PDF document text
    • http://alcozerox.com/performance_appraisal_comments_for_team_leaderz8ei9.pdfIn PDF document text
    • http://leadtop.co/fivabamllji.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/5f89f6d.pdfIn PDF document text
    • https://vemubofopelo.weebly.com/uploads/1/3/0/7/130776521/0778038a9fd3d4d.pdfIn PDF document text
    • https://lovevupadu.weebly.com/uploads/1/3/5/3/135328586/d4ec709.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/mirrors_eduardo_galeano.pdfIn PDF document text
    • https://woraragupawajup.weebly.com/uploads/1/3/2/6/132681931/zonanadowovuz-degerijig-bideru-libosusunat.pdfIn PDF document text
    • http://larebalin.mypressonline.com/83033244526.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/dukajevo/2612515667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3413f42-6f10-46f3-b07f-10d6123ce740/6800101236.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/android_developer_salary_in_ahmedabad.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/julime.pdfIn PDF document text
    • http://xunudijumo.myartsonline.com/save_adobe_smaller_file_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254942ce-3e6f-476e-b1f7-7aaa2d523175/how_to_find_isoquant_slope.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/86864352786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c530062f-5d0f-4039-9571-a15d1e6d15c0/30780814586.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/fanulepevomalerez.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/7896020679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6a3c27-a299-4d86-86b0-a35e4009823c/a_christmas_carol_movies_1984.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_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 5192 bytes
SHA-256: 944b960e1c37acefadf3bb0c58098ada75a4f9b2cfb43df2636692d8b6f7db19
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 11104 bytes
SHA-256: cba5e05987e4e438a2211b766c09528356ecacdc20583f2b9968bb90a7b58bd5

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