Malicious PDF — malware analysis report

Static analysis result for SHA-256 273fb0096b89c7d6…

MALICIOUS

PDF

79.7 KB Created: 2021-04-05 23:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a7d6de1097722aaf382ad3214c4d586e SHA-1: d480c9eca21c33727e59bb4326f603474c09cd06 SHA-256: 273fb0096b89c7d641adb74330d6aaad06b0b00ad74b802ee2189ce4b6fbd8aa
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to direct users to malicious sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/strik?utm_term=relion+ultra+thin+lancets PDF link annotation
    • https://vifiboreb.weebly.com/uploads/1/3/5/3/135349596/sajinewamem-wadafeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477369/normal_604f1806bd7ad.pdfIn PDF document text
    • http://daxavepevepa.mypressonline.com/nuclear_power_plant_operation.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/gotokafajitinasak.pdfIn PDF document text
    • http://tapopapebesawu.getenjoyment.net/14511918815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_6008fb563a899.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/bpssc_si_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450630/normal_5fcab9b5d3dd2.pdfIn PDF document text
    • https://vojitimene.weebly.com/uploads/1/3/4/5/134596684/5486314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_6042081ae6169.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/zufojadibi/mbti_personality_types_explained.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/all_caste_list_in_maharashtra_in_marathi.pdfIn PDF document text
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_8770212ca2d2409eb0d9a2deb485018d.pdf?index=trueIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_59840cf1223849b687709c3ae5469e2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukujidor/43901798377.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/xedobadisujenuvuximokuxom.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/wifijo.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/jazobisebijareseran.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_a28e2bad0f53409d9dd6ba7c57ff4d24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/arpeggio_of_blue_steel_movie_2.pdfIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_6916ac1431bb47c9a2fe46ddbd49f945.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunojipu/rogavibuwufixen.pdfIn PDF document text
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_eb1250fb74854a6bb4dd2be658bef942.pdf?index=trueIn 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_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 4896 bytes
SHA-256: cebfb3007335a80c69aa237841da873e0a665673a04c26d871d3384539f25cb1
font_01_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 11632 bytes
SHA-256: 883833fbc8f4c1d056a8cb1b52dcd964ac1750a59de41f78d4de76bd50e7f227

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