Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a9db49855fd033…

MALICIOUS

PDF

141.7 KB Created: 2020-11-20 03:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 01c59eacf7f79e477d97fb660336b042 SHA-1: dd7468e071549dde224b39034f56d0a334daf376 SHA-256: a1a9db49855fd033a319603103b9437709176dca1b51177a0c130c5331cd0fa9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/aws?utm_term=algebra+with+pizzazz+page+104+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f89f6d60e915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424037/normal_5f9c60b789194.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_5fb718c35ec8d.pdfIn PDF document text
    • https://velebipuzufal.weebly.com/uploads/1/3/4/4/134434208/bfe88bb819fce5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5faadca042929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474170/normal_5fb34df5a05d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f9c9c425fd00.pdfIn PDF document text
    • https://javodamujuwevef.weebly.com/uploads/1/3/4/4/134446411/nufamise.pdfIn PDF document text
    • https://gazofifato.weebly.com/uploads/1/3/4/4/134496451/8096847.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/6287688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_5fad8176560f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_5f9784e107bed.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/zonivezada/informal_assessment_strategies_for_mathematics_classroom.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_off0001ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF91 5632 bytes
SHA-256: 2160fbe722447ddc1aac64f5c00e9fe2af0493aafc85c6cc2124aa6615e4dfef
font_01_sfnt_off000202d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202D3 11316 bytes
SHA-256: c6ad01c8ec0c5b366537c1364935e21c9c577ed55a8555311788b88d018c45b3

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