Malicious PDF — malware analysis report

Static analysis result for SHA-256 3438ced669faa315…

MALICIOUS

PDF

65.2 KB Created: 2020-12-17 07:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 87270fc98737460300bbe827f28bdc32 SHA-1: 8921c4d497a583cae69f1b46a12ccc782e8243b2 SHA-256: 3438ced669faa31595177c1e18b4c5cdcdbd24be3512095745e55d552d6e27ba
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 0.9998

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://traffine.ru/aws?utm_term=large+cursive+letter+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427499/normal_5f999220ca70c.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/kikunesifufune.pdfIn PDF document text
    • https://nugizutotenit.weebly.com/uploads/1/3/4/5/134502776/a3417539957ef15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_5faa018687797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5fa4376439163.pdfIn PDF document text
    • https://vimudizod.weebly.com/uploads/1/3/4/6/134632239/dekabajiwegetu.pdfIn PDF document text
    • https://jonowukamox.weebly.com/uploads/1/3/4/3/134372820/fibuxivaw.pdfIn PDF document text
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/7773541.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/tetazino/sociological_imagination_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/gozuxadumuzu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc389b02cf09257bd7c80b9/t/5fcbb1399708706f39a14a22/1607184697982/microsoft_azure_logo_transparent_background.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/honeywell_vision_pro_8000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/9671008031.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e01f2cf09257bd6be9c2/t/5fc3249e173fb5383b0a69a8/1606624415685/pink_dye_minecraft.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/73734702051.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_off0000c52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52A 5252 bytes
SHA-256: 3dc008825d1d81e4913df4c1dd46c68223033563f73d540ab3a2304944292e84
font_01_sfnt_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 9648 bytes
SHA-256: 8b8bf42ad4075cad27e774614b13ca7fb3321ffe1bf5bc2b24b5f1ffdd2fb6ed

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