Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cd8e7b9fd41e02…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 18:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e156e97559313e2f25009ab38402217 SHA-1: 76e119c7c60cfbef754290e694710fde54c9cba9 SHA-256: d2cd8e7b9fd41e0265102356f9e3f22cf43ef2f660bcf8f9433985b42a324a30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with a high heuristic score for being a link farm on disposable hosting. While no executable scripts were extracted, the structure and numerous external links suggest an intent to redirect users to malicious websites, likely for phishing or to download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a large number of distinct, potentially low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queensflower.nl/clientfiles/38199748770.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/xaroparukalowab.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/14959536735.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/90454105354.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/kasuxaxodunesujagoba.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/mosemawurofamudaliragiju.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/fagojarejolaxukafupiko.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/45759159501.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///dogiwod.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/tawufi.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/favosodemukubewowemes.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/jetosurebepa.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/55397732835.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/92667288168.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/nigowowipabozovinuximad.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021917174241.pdfIn PDF document text
    • http://nensi.si/upload/file/42968490120.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/12462407167.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/luzapekufatuneviwinajit.pdfIn PDF document text
    • http://gibisch.com/files/files/fitaxiriwefejimi.pdfIn PDF document text
    • https://architektor.ru/uploads/file/gibetoboferozupalev.pdfIn PDF document text
    • http://findusafranchise.com/files/files/wokabapujaluzunebefogotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+vice+city+apkPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/biludu.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_off0000b327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB327 15600 bytes
SHA-256: 044f0f6218996707e37ded24ca2e5c73ed1834541f1e27a489013ff3903c1046
font_01_sfnt_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 10140 bytes
SHA-256: 2115aca4bd43bd1e3f0275756a6d51e4635bae53bf887bd6816d86185a5b807c