Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb51a61f5ce4ef3…

MALICIOUS

PDF

71.3 KB Created: 2021-01-03 08:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 630bc200193b3c2b65a156074a2055a6 SHA-1: ee1cf2b197f0cce6d193cd6bcc79048ee00d8bd9 SHA-256: 5bb51a61f5ce4ef3654aa7e25c09b9ac21031c02a3dcab862aba0fbef3cbe09a
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 detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, mentions a 'study guide for spanish 2 final exam', which is likely a lure to disguise the malicious intent of directing users to potentially harmful external 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://trafftec.ru/123?utm_term=study+guide+for+spanish+2+final+exam PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fe544924bd35.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/ggYgehj/music_disco_70s_80s.pdfIn PDF document text
    • https://cdn.sqhk.co/vavuvalegel/jdD5jgb/jokamuvolobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457572/normal_5fae2274adb9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485714/normal_5fb5cc2b2d8f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417049/normal_5fc3d19eb6fd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414360/normal_5fcc415cb0866.pdfIn PDF document text
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/ditemefivi_kusikolano.pdfIn PDF document text
    • https://zufopawel.weebly.com/uploads/1/3/4/4/134462865/19f8e.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/hfb6jgw/gegelazixinelidavilax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_5fbc66b609a9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_5fd5fdc124f65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 5744 bytes
SHA-256: b416b14d0c5a37ee59378170ace242e05d22ef1dd82e8daa9d389c358cf647ce
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 10240 bytes
SHA-256: fb1cb1cafe4023975b6d67f697836891bc992b47763db39028e351ae168ea377
font_02_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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