Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b1823766975931…

MALICIOUS

PDF

79.4 KB Created: 2021-01-19 19:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: afb594a0fbad65ee9676b4c02e229a8d SHA-1: a61c41b658e4e2f9e25ff2a72fe4030a7fa5a5ce SHA-256: f9b18237669759316c8f59bfa2125be4b32bc8b589c19ee79f3b01711ef94c28
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting or known redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document.

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
  • 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 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://cctraff.ru/123?utm_term=fundamentals+of+project+management+pdf In PDF document text
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/laxafazaveravaxozek.pdfIn PDF document text
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/fibipikutaleve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5f8bbde6dd3ed.pdfIn PDF document text
    • http://gajozemexip.22web.org/kauai_hanalei_bay_surf_report.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/t5Hjeha/capital_funds_defined.pdfIn PDF document text
    • https://site-1167963.mozfiles.com/files/1167963/26861244379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_60025012d5627.pdfIn PDF document text
    • https://site-1220367.mozfiles.com/files/1220367/pisepesudiluwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5fef503bacafd.pdfIn PDF document text
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/3507255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5fecb3681745b.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/nugivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fe73e2f61a80.pdfIn PDF document text
    • https://site-1246216.mozfiles.com/files/1246216/tijamefelobe.pdfIn PDF document text
    • https://temevukovekolax.weebly.com/uploads/1/3/4/6/134688950/7a6f1f898b05.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/57415996558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://retuguru.epizy.com/ey_asc_740_guide_2018.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_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 5504 bytes
SHA-256: 4c1f66b9f3b2e3fccda5bb287d6bac77f02a3db8d9db5350d33fcfbc702eef5a
font_01_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 10748 bytes
SHA-256: 4cb27a4d4fdf1965922e1a0b05d3a2c238a12d6cae4e0898069ff5a2d3f8431b

Open this report in the interactive analyzer, or submit your own file for analysis.