Malicious PDF — malware analysis report

Static analysis result for SHA-256 1444829c40b76aae…

MALICIOUS

PDF

68.2 KB Created: 2020-11-23 16:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: aa27188f67253a780bb708890c1be1b7 SHA-1: 2d070684f317f64ef36be8821eb1edd4f85d37fc SHA-256: 1444829c40b76aaefcea8731aef3661ea6b40adcbeacca9ae529a234d5de1274
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://traffset.ru/strik?utm_term=xem+phim+tam+mao+phi%25C3%25AAu+l%25C6%25B0u+k%25C3%25BD PDF link annotation
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/9048649.pdfIn PDF document text
    • https://sagelaxun.weebly.com/uploads/1/3/4/5/134594749/01b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5f906b556a9ec.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/b77c62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5f8f22c3e80bf.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/sukobogixe/33412080349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2d7e9b-b14c-41d8-aabd-7c965c2b8ff6/74223294612.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/34853869595.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/bubble_letter_r.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/router_app_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2c8299-bf4f-4b67-bd4f-699f987ec786/fireritevonivikuxoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496bb9c0-a4e3-4fa0-ae40-a1ff6e1c0123/google_drive_insurgent_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/safonogotonasuximitudozev.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_off0000c0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BD 5236 bytes
SHA-256: e4d63369814b63adfac5abeffb361f385b350ccaa9c92cec716035641c0d62bc
font_01_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 21964 bytes
SHA-256: d387a04154274f8ade6ee14596521b7b66e2b20fadddd5041b66323a853222b1

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