Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ee83681f477867…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 05:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4b24a229b3b4c54e9fbc0ca3125fb53 SHA-1: 3060e2191dda86cec8e4519e828b342b07aef316 SHA-256: d1ee83681f477867fc88269a2eb2897b6f3636cedbd8ae9fb3c649ee790277d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Numerous embedded URLs point to potentially malicious PDF files hosted on various domains, suggesting a phishing or scam campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bselink.com/userfiles/file/96484794620.pdf In PDF document text
    • http://hoangnamjsc.com/upload/files/2464129716.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/tiregaxojejarixowuzir.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/sefemuwozujunalezonawalil.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/vumolinuleti.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/65129061940.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/89905355004.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/90514912489.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b8a68693f3b5835a52e6f157d7ef72b9/84834431880.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/47862861516.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/43910334672.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/fee076bf0331b9c379d3a44991c924c4/wojikijinawapuwava.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/kireru.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/23759123532.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/paxunofuvetokimoketamawon.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sibajununox.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/20496500806.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/30595682927.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/97540708801.pdfIn PDF document text
    • http://chipgene.com/image/files/20210914_040220.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/poletuwofigo.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/28494585209.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/54338002635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=1337x+latest+proxyPDF 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_off0000c113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC113 10440 bytes
SHA-256: 57d72f6a5912223bbc54c62bffecb0eba1ac5a1976c7034c1465647369323eba
font_01_sfnt_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 17240 bytes
SHA-256: b9ad17e980bfd79cdf007cc8bd75b9600571cda77878e6fc5bd913231b09c15a