Malicious PDF — malware analysis report

Static analysis result for SHA-256 487821bcbd8bee30…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 18:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e433d12fe63f12dd441bddabf7545660 SHA-1: 61fa7f2b781db1957d4993fe65019eab7650fd57 SHA-256: 487821bcbd8bee304d0686f47a1795c73ea3a3e84e084ff82e60d6315c5577eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external sites, suggesting it is used to redirect users to phishing pages or download further malware. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://nomylo.ru/uplcv?utm_term=age+of+war+hacked+apk PDF link annotation
    • http://ideatity.com/ckfinder/userfiles/files/62996142356.pdfIn PDF document text
    • http://kodemari.info/data/files/71809069644.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/gafifoduri.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/64609386777.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/bizofozisuvatepevoxola.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/piwuxopabesumafoxovix.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/sejuvuzafenudavuva.pdfIn PDF document text
    • https://viettrungson.com/media/Files/69268158310.pdfIn PDF document text
    • https://viceda.com/userfiles/file/witolopovase.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/fajosawevusoxame.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/81192769496.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/lujogerevululofowak.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/bafur.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/88718030517.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/mapikusewoxasazipisi.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/xavewoxojajebujanaz.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/xatipebesexawejib.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/juxaxu.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/85003009981.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/safute.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/niwakiluritiwigoxu.pdfIn PDF document text
    • https://ratodua.com/contents/files/65887176499.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/loledakupagixarivafiwuv.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/vulezosebexisu.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/furemokanomajomubipudurav.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/76638461733.pdfIn PDF document text
    • http://jiab.net/userData/board/file/xotitujajisolan.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 18012 bytes
SHA-256: 88de5c1d3d3ab274d97887a05bc1b779272328cf6fccd02857834a3662979c6a
font_02_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 10548 bytes
SHA-256: 6ebd0b2fb42d598e5153dec349480fbfe785eff3010a670336391a4f952941af

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