Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4ba369d026b185…

MALICIOUS

PDF

65.7 KB Created: 2020-11-10 04:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ed6d1bbc293c689b6b8754ddb461dee0 SHA-1: dec88caf197e6dd3da2a4dfc6d62c51066fc66ae SHA-256: 9c4ba369d026b185abeed746849170d2d65d7f717cec6a4199fb91efc9277d53
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://traffnew.ru/strik?keyword=edmond+public+schools+infinite+campus+login PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421056/normal_5f98ba2437bed.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/bujaf-nasagoxuduz-pufete.pdfIn PDF document text
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/126d61da0e16625.pdfIn PDF document text
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/vixagupusozagos.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/f4c5b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5f9ca530b230b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f97ca1912f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5fa03efd80020.pdfIn PDF document text
    • https://venifamu.weebly.com/uploads/1/3/4/5/134501621/0b34b70368ce.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/gogonof/snowboard_games_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af81949a-a7e6-4eaa-8258-96e25eeb9e66/wujad.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_off0000c287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC287 5568 bytes
SHA-256: 749c13c67a6ffe0107bbfa3cfc45c8e06db656706f926f780430364332f628bf
font_01_sfnt_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 10844 bytes
SHA-256: 2a9c3549aa9ef6d6fc5bf80cef82ae1aed0e79802d6419c9f9629701d2adbe67

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