Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fc61300f61d925…

MALICIOUS

PDF

58.8 KB Created: 2020-12-18 15:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bdd0b718da6e846a6194c06d2297536e SHA-1: 7817cfbc5d25bc7aa13d8088e84dfcb0996fd67c SHA-256: a7fc61300f61d925ee515726db49a802eee400f7e6399dc9908faf165f749a0e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site or download further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the redirection hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://trafffe.ru/strik?utm_term=the+biology+coloring+book+answers PDF link annotation
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/risamusabuw.pdfIn PDF document text
    • https://mavobomuwatu.weebly.com/uploads/1/3/4/5/134592479/b917070.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/lasafojowemer.pdfIn PDF document text
    • https://nekizinatuzi.weebly.com/uploads/1/3/4/3/134325328/5131609.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/5095107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9468325b-8e07-47db-92cb-927f13736bee/code_org_answers_lesson_8.pdfIn PDF document text
    • https://s3.amazonaws.com/nepawigexa/jepezivetimabaratol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228fd167-6771-4964-bb44-865f9704890c/30295924398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd251bff-ab86-4582-9769-552b4c70514f/kuxojinadivunipavovaloko.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/50205869810.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd3c3f989642488511c88f/1606237248726/trucos_gta_4_xbox_360_tanque.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b617869-317b-45cf-b4f7-2d46c6e38c03/pelujulefugikab.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_off0000aafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAFC 5408 bytes
SHA-256: 59db5cc16b1e26baff2377c621ac8a5c0b9a901c628774bf2f95072674cc1922
font_01_sfnt_off0000bd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7B 9876 bytes
SHA-256: ebfd278eac37622128b352839a42f69c4f15b6be888c866367807fae1983d1e3

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