Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d20aa47efd9f3c2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 07:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 153cc016ed661e88bc58c4ce1bdb0814 SHA-1: bf412fef31e1662f122b43c9a9fcc58b76d76185 SHA-256: 1d20aa47efd9f3c202dcf10a32ae8c536b115f42325febdfcec139d3a4a1abc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, disguised with terms like 'movie download', suggesting a social engineering lure. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://best-of-geldanlagen.de/userfiles/file/fokasuboba.pdf In PDF document text
    • https://editionsitaliques.com/userfiles/file/56788954845.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/71481439459.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/gezuvulupeveteku.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/97539992605.pdfIn PDF document text
    • https://airxps.com/userfiles/files/82733223080.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/vadebubur.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/votakibobu.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/85978520725.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/xakewavovamunad.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/beridejizuxomununa.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/dakaja.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909221254209.pdfIn PDF document text
    • https://12shio3.com/contents/files/tazuxakugumoxofefevogar.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/bogusajobisenerug.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/jutexowefot.pdfIn PDF document text
    • http://dfanchem.com/upload/files/gevafoxawu.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/92281846548.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/84801506485.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/gejufabetubidovutoli.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/kiserezawitewa.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142afd481e7a---68173072134.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/14162239395.pdfIn PDF document text
    • http://selidbe-beograd.info/files/roxada.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/rivasekiridixokaniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mar+gaye+oye+loko+full+movie+download+720pPDF link annotation
    • 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_off0000c493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 11316 bytes
SHA-256: e03fe7767208f7f0187618a360a6bae904156047eae53cfab586656961cd177b
font_02_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 19500 bytes
SHA-256: 05dc9fb270fc6235b83483dcc6a9fe88b30e950072b40735a32f346418734647

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