Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d4e25062e212ac…

MALICIOUS

PDF

67.1 KB Created: 2020-12-18 03:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 266b1dc8a65e32d8eb5fe1db3a0ad4f8 SHA-1: 958ad4f152c640cb3a31cc29a8ffc7ddab25fc43 SHA-256: f1d4e25062e212ac8edaaa00f97904b044373f5667b76efec13739bbd69e7fa1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links to external resources, a common tactic for SEO manipulation or distributing further malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, suggesting a malicious intent to redirect users or host malicious files. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or trojan delivery.

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://traffset.ru/123?utm_term=prestige+alarm+manual PDF link annotation
    • https://febavezexiwajo.weebly.com/uploads/1/3/4/7/134703432/ded8ae.pdfIn PDF document text
    • https://sefariduzaki.weebly.com/uploads/1/3/4/6/134665623/1372287.pdfIn PDF document text
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/sejulako.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/mamufogadanoxi-zepaxedubi-zatelapafu.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/zuxadol/kvs_offline_admission_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e95f9e-48f2-4f62-ba3d-14d25d29726e/40989398603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3d8ebb-7367-4476-93de-8eee3fce8b9f/51323031818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c966af-80d7-41dc-9592-8607df8a990e/jordan_santos_update.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/28000739470.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/zisuta.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/annual_budget_excel_spreadsheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/taxudavumivokasova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f53cd4-d24d-45e5-b6e8-80fa23fec18b/73792062949.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/62684083063.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_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 5008 bytes
SHA-256: b9adb72ecce36fa28e276f2bd4605d1c2eb1dfba5f345f54e3455d9b45a44749
font_01_sfnt_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 10828 bytes
SHA-256: 5719930dbfbe2dc49f03fde80c3c1ecfdb6a3111295e7115d7bae925395bdd48

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