Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d7e7cb02dbccb9…

MALICIOUS

PDF

79.4 KB Created: 2021-01-06 11:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e8315adb46cf7be40de2c189e3824f13 SHA-1: 55084252cb7ff2291d59e80459f539e7dca60f4d SHA-256: e4d7e7cb02dbccb946aeb6a3088f575a8a059834cf647ba9fda0f7fb017e192c
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to disposable hosting services, and one specifically to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure, possibly related to a report, to entice users to click these links. The presence of numerous external links and the detection by ClamAV as a phishing trojan strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/aws?utm_term=blackwell+first+school+ofsted+report In PDF document text
    • https://cdn.sqhk.co/sugezigo/MijifKx/dbs_coin_drop_machine.pdfIn PDF document text
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/4082494.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/19nvnrR/stickman_adventure_games_unblocked.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/4c56873f08e1458.pdfIn PDF document text
    • https://wakuwuwosabi.weebly.com/uploads/1/3/0/7/130776519/b7b1a3ac247d5.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/4dc951978ffe7c.pdfIn PDF document text
    • https://nelugawoteraxum.weebly.com/uploads/1/3/4/7/134707069/kaberefa-zuxabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5fe85db4b7677.pdfIn PDF document text
    • https://mowasevibipogo.weebly.com/uploads/1/3/1/3/131379904/9878991.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/1186497.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/3579216.pdfIn PDF document text
    • https://tutamakut.weebly.com/uploads/1/3/0/7/130776204/91772a432a.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/kokesatodixon/25307117584.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_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 5448 bytes
SHA-256: 23979b24cebf51471304b57c817c8dfa847d393a9baa245679b070c420f567a4
font_01_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 11012 bytes
SHA-256: 4e53c4db33ffbcbe16f552f2312728fa59dd2a2819b8704407b04a0f7f59dee5

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