Malicious PDF — malware analysis report

Static analysis result for SHA-256 2012406644df9737…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 21:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 161e7366b1a9e81b8e4df840a77bc82f SHA-1: 9e5dcd575534842d1393205b880925e31643d1ee SHA-256: 2012406644df9737fc3526227ce7fc6ec7683874b701885e4632742742fb5c6c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_URI heuristic further support this, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=willy%27s+wonderland+full+movie+123 PDF link annotation
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59957500762.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210910060704.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/dovuramigemanefajasobe.pdfIn PDF document text
    • https://equimat-cheval.fr/file/28085196493.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/bipevotojukuwuleduno.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/11887342009.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/35960628338.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422fe5ada2---42274873733.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/5912450418.pdfIn PDF document text
    • http://onlinevay.com/upload/files/41781149847.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/45175142448.pdfIn PDF document text
    • http://rurisnet.org/images/file/95553222682.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/35105275193.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/sozugunikutilirimuxiwor.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/63525693252.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/46749524318.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/jobivetene.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/rolaje.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210910093849.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/43267807011.pdfIn PDF document text
    • https://zhansq.cn/upload/file/38256981768.pdfIn PDF document text
    • http://wawa757.com/uploads/files/89216692855.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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 18740 bytes
SHA-256: f7b6cf8c7e1c961631133c291b8fa033ed51d9d3d0db955069b444b72c91aac4
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 11156 bytes
SHA-256: ddd9e08335213a6550ef5e7824fdbca3fc16140eb2de76fd822975788f62121f

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