Malicious PDF — malware analysis report

Static analysis result for SHA-256 313f7ae0681bd587…

MALICIOUS

PDF

79.9 KB Created: 2021-01-04 11:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 07445293651ca922cd199189b9002f94 SHA-1: 9742b3db794716b5cb6f1d5dee804b796396aee4 SHA-256: 313f7ae0681bd5872862b464d9d1a1281d19d7d2b47d56fe85b106e17679ca21
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and one of the embedded URIs points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?utm_term=calligraphy+books+pdf PDF link annotation
    • https://cdn.sqhk.co/zetanitanedo/jcBijgj/20466521911.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/kikoxaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fd82826bcb1b.pdfIn PDF document text
    • https://cdn.sqhk.co/fekolisuzub/iaOlYBf/nanem.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/hjjvge6/wojezefudapojaxal.pdfIn PDF document text
    • https://cdn.sqhk.co/wirujurumugi/gbPHpji/99734052483.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/nuxomigo/29884021858.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/template_blog_gratis_untuk_online_shop.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/finding_slope_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/92140763846.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/java_64_bit_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/39428177417.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/mizivuvikaruzejekugu.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_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 5512 bytes
SHA-256: 93287936fbd6eb5246e2473b895ee92145bcf965e580600a3c7f34ec462cfa4f
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 10140 bytes
SHA-256: 6a96d1d6d4d96c08530111bf76d40b65fc046c2ed20602641bc07b1bbf7a4144

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