Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7f378d9e5e950d…

MALICIOUS

PDF

71.9 KB Created: 2020-11-25 19:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 86a86e411f43636c4f062451a289a191 SHA-1: 4d8998b52602a9addaaf94cd33e975186db801e6 SHA-256: 5d7f378d9e5e950da37bf3b73f50f63905d47c31124eca3afaeb08e83bfde426
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, many of which are hosted on dynamic DNS services, suggesting a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=rhodes+frozen+bread+dough+near+me PDF link annotation
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/796a1db0a501b.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/0312cda65d.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/90ac22638010.pdfIn PDF document text
    • https://rokudula.weebly.com/uploads/1/3/4/0/134017654/kukum.pdfIn PDF document text
    • https://fetozoweriwoj.weebly.com/uploads/1/3/4/6/134631739/8606222.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
    • https://s3.amazonaws.com/ribowexulo/amish_tripathi_raavan_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ce6282-9144-4304-b068-8b4d9f2b02b8/22454732405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f06be76-debf-43fc-9ab4-9f62e586e11e/99096700026.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/fsrh_contraception_guidelines_ukmec.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3fb221-8754-4b02-a5f0-d2d949bef0f8/ganupisegesog.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/59780236626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85214132-ed0e-49f5-abce-088526d7c131/pexubewizufefaron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5019af-ecf0-4ac7-9d0c-c84781c46dd0/55321448266.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE48 5240 bytes
SHA-256: 9db503b2d61adf07461c885e616c6dcf58b651df2061ffaad51dd3885fc249fd
font_01_sfnt_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 2896 bytes
SHA-256: 31d7c77c763a005fce3bcf056ff926f4b0292701db4f149e0ce14563b5848b33
font_02_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 11504 bytes
SHA-256: d568c41cfc55c215253bdeede5f3bd89138ace03479295bbb6b9ef25b14e4d96
font_03_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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