Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70848a12b9fe5cd…

MALICIOUS

PDF

69.1 KB Created: 2021-02-07 10:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 19773f1a365f4e3fde8c2201dbda89e3 SHA-1: 24c44135efea17f446ef2262afd0828449cf7150 SHA-256: e70848a12b9fe5cd6928c2ef43e81f98ae5649467b59480fc2b310384e199f4b
156 Risk Score

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 for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 30 links. The primary URL observed in the document body and heuristics is 'https://leonvi.ru/123?utm_term=enloe+high+school+raleigh+nc', and another significant link farm URL is 'https://cdn.sqhk.co/wifepodilojo/gnidgfR/free_rock_roll_music_downloads.pdf'. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=enloe+high+school+raleigh+nc PDF link annotation
    • https://cdn.sqhk.co/wifepodilojo/gnidgfR/free_rock_roll_music_downloads.pdfIn PDF document text
    • https://rawewarox.weebly.com/uploads/1/3/1/3/131379085/kaxaf_biwanavowa_koluvexago.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/wLiejaT/mavasiwabuwizisoge.pdfIn PDF document text
    • https://kedefakoriwo.weebly.com/uploads/1/3/1/1/131164231/e2ec58b0b4ca198.pdfIn PDF document text
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/gimojojegum-dojiviwatonesud-mapiraka.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/hahe8ww/zufodom.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/kupixowodafifefujine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fc6025934d2b.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/salade/11627782085.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/wejaxokibipejeves.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/bangla_romantic_natok_2017_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/afcat_question_paper_2017_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/expanded_metal_sheet_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/year_end_sales_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/gasugumezinamekuwa.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_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 5016 bytes
SHA-256: a23efb74836583f34cc86671a7e8510655ccd6cb6f23a3fa5ee4d379edab564a
font_01_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 10804 bytes
SHA-256: ae27e481e968cf07dc1e0f4060fe481e5a94524760d9eb91a0bd525c82eabc5e

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