Malicious PDF — malware analysis report

Static analysis result for SHA-256 9180d3223c17b5e9…

MALICIOUS

PDF

87.4 KB Created: 2021-02-26 11:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2fea559cd69709b8caa134e8aad8ba6f SHA-1: 16bf4d69b5f9784586b478749316b4822e0ce989 SHA-256: 9180d3223c17b5e920438bb34bd511d621fca46aeaafa508aea92d316a12ee40
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The presence of ClamAV detection and a high ML classifier score strongly suggests malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=are+tax+rates+changing+in+2021 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402964/normal_5fffa4a4aef82.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/zejerok-rozavixozi-tejuxan-figolak.pdfIn PDF document text
    • http://rafuzigukogare.22web.org/samsung_m2835dw_toner_singapore.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/3441785.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/best_shows_on_epix_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_601368c1f0c68.pdfIn PDF document text
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/durufotore_dewutineko.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/risk_benefit_assessment_form.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/caef6.pdfIn PDF document text
    • https://jikezukirex.weebly.com/uploads/1/3/1/3/131383594/79978.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/zadularesitefojejepok.pdfIn PDF document text
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/dedixe.pdfIn PDF document text
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/b5ba84dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_6011a5bd3afb8.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/why_does_my_whirlpool_washer_not_start.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368767/normal_5ff3d4cd20b2d.pdfIn PDF document text
    • https://putepinezuvoko.weebly.com/uploads/1/3/1/8/131856998/fixaxafolu_gagem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sugazaxarul.epizy.com/simobesi.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_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 5412 bytes
SHA-256: 987d6c80659b0fa4e531f3a61434e872358bcf649dcab4b5a435f17a80594f34
font_01_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 13840 bytes
SHA-256: cba4b9b5daa5945b458ce69f805d8652247ed9e909298efd7ffe6dbbd89f2ee7

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