Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5186222a3f7458…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 15:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82bc621b03a072306cc2feb77ba958c4 SHA-1: 140c968e32bfec020cc0cd2f9c21a5505c5f56b4 SHA-256: 7c5186222a3f74589acad7304b4258eb7bb582c969d9b301435dad16056d59fb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to PDF files hosted on disposable domains. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment, suggesting the embedded JavaScript likely facilitates the download of a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=evil+genius+2+apk PDF link annotation
    • http://funkyspa.net/ckfinder/userfiles/files/xoravu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145bc19501bb---nokuvuvasipazi.pdfIn PDF document text
    • http://czyxchem.com/upload/files/3936234330.pdfIn PDF document text
    • http://chinazzjx.com/d/files/niwekojujomufuvurinu.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/zemiziverim.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/87762897190.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vajaruvadaxiwufijevusugo.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/totexotasogenud.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/68270271467.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/60658343460.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/22789976292.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091320520973499.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/97865250001.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/kabifefatibowutajini.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/36663634002.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/xixigezoseliwepime.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/jarevarexofu.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/36453478812.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/togavu.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wazokesujodij.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/45220066359.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/sabirosugejurapiwomexij.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_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 10468 bytes
SHA-256: 98ec14499616d6219c5f6677b9e4715ccdf45c1f9dfe6be724a60a6c1a515c9d
font_01_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 19360 bytes
SHA-256: f60c4fc07b75ac8fa714def43de441e555e651ab4c628e6e68fa4bdd959f98ef