Malicious PDF — malware analysis report

Static analysis result for SHA-256 06681cee3ea40d1f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 07:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f5f8c2dd50ef680b3e0fa2a0c25e8147 SHA-1: 82cf6b3f8cc6eae52c2369243445c5065cb31670 SHA-256: 06681cee3ea40d1f84a93e353d2b92c89bf16140293b66d0cd7a85bb4e3f00d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a link farm with numerous disposable domains suggests a phishing or malware distribution campaign. The embedded URLs point to various PDF files, likely serving as the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6197

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://zzquansu.cn/d/files/mulidetatujomero.pdf In PDF document text
    • http://leaguengn.com/userfiles/file///17930560190.pdfIn PDF document text
    • http://friulanapanini.com/images/file/vexevuzes.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/10069689821.pdfIn PDF document text
    • http://iphysiology.ru/upload/fejopafesalaramev.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/jusisugabafebonarukiz.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e58f02d56d---vekoberutileb.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/dulafozejikubawudos.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/78185719881.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/tubawefeporufanitivote.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210920_140039.pdfIn PDF document text
    • https://tavio.ru/files/file/82622532019.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/viluw.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/34901892879.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/81061467614.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/65842109560.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/7113799928.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/34197987090.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/dozavatusewetasimol.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9041b9fa6---jilesuneb.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/23262247515.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/favikopunu.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/99785017522.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/dusizikujipokugoxob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=backstab+mod+apkPDF link annotation
    • 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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 18344 bytes
SHA-256: 51fde35a202888b9aa7588f1902163516f36d609848cccdb26ee862191e40ebc
font_01_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 10484 bytes
SHA-256: c3c186c55c61f416f8770edc43c1f2dcb4d5ed09e6c08c0c9d0ef1cbae41f88a

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