Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de714990fe895c7…

MALICIOUS

PDF

69.3 KB Created: 2021-02-21 09:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6dd8ae3e7e9624f4df6338e0a7bd6cf4 SHA-1: 3b643adb1a9425c2c64d856fbd604cbf3ffda0a9 SHA-256: 3de714990fe895c78cdd59f2abe575719adb8a5726f906ab98a522b35ad64b9b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=basic%20math%20online%20assessment%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_602303226f654.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/dvhehhh/66142547815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417140/normal_5fc7fc60bcf9c.pdfIn PDF document text
    • https://nukarudurarera.weebly.com/uploads/1/3/1/3/131380042/8016313.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/hejaYgf/free_christmas_coloring_pages_by_numbers.pdfIn PDF document text
    • https://dizufarul.weebly.com/uploads/1/3/1/3/131379939/kupexinolonor.pdfIn PDF document text
    • http://br1.red/velodyne_subwoofer_15_inchlm8rm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_60122787bb778.pdfIn PDF document text
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/xufafoxewina.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/gia6gfy/orange_ball_dress.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372376/normal_5fc7d459c19f0.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/vukusa/manual_usuario_citroen_c3_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/xokugulugegiwizagore.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/kininum.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/bottom_sheet_dialog_android_library.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/60120181494.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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 5348 bytes
SHA-256: a1bd00a5aa3672f7b5829ef76867537e732869123290fc6b24a151bdaa6501c6
font_01_sfnt_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 9780 bytes
SHA-256: 201cc1feeadd045ae1c2da74e8119bcab6affb96a9c36479af7847315db6d35f

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