Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccadd932caae711…

MALICIOUS

PDF

72.1 KB Created: 2021-01-04 00:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 403f7baa66ff704904d5a5c11321803c SHA-1: efdb78389f9125a1ecb113a27840209c1fa8c567 SHA-256: 3ccadd932caae7119a3d1f37698e43cf485810b3b3cb898f0c42c27ad2fd8042
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to "Bloons monkey city mod apk 1.12.3", likely a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://trafffi.ru/123?utm_term=bloons+monkey+city+mod+apk+1.12.3 PDF link annotation
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/1680478.pdfIn PDF document text
    • https://cdn.sqhk.co/fabavukunatu/1jxSt6C/24292036945.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn PDF document text
    • https://tolutewegudef.weebly.com/uploads/1/3/4/0/134097468/23813fb5e.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/3e1eac.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/rhgWBhb/zesiz.pdfIn PDF document text
    • https://vurifupilubat.weebly.com/uploads/1/3/4/4/134495287/6583428.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/c83b54e0-6359-4add-8f29-60d04bf6c4ba/carpenito_nursing_diagnosis.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/99509578017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db30e16c-06b6-4bdb-b404-6b3eef953665/5e_vampire_class.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c67afc-5b12-478b-92a6-a85db4fdbff6/morovonukoguvugimaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa523cd5-e481-4aa7-bdce-c35e21a4c207/bukozavifaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cee4d55-08d8-4db4-b2d9-5e4dd1467f4e/3802505493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9a82fb-6ed1-45f0-a6e5-ac396cdaccd9/he4_kenmore_dryer_manual.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_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 5716 bytes
SHA-256: 2b60e81f10d70874e0c4bac94fe0de0ee516f71bc05d68d9295f8f686e1e51f8
font_01_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 10604 bytes
SHA-256: 6ece9de1884d14c8710af1f7a509d0aca6bce5ad66b70cdf97a49cbf54497985

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