Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0a9baf81f86e68…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 14:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5ccbee8397b3112b78a506280a0953d SHA-1: 6eb39f4f94235df606155553048d4333cc4f577e SHA-256: 5a0a9baf81f86e684d2ffc259fe50925d692542448e4b8980f2db350f8ca50ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for these links, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://smidgel.ru/uplcv?utm_term=touchstone+3+answers+pdf PDF link annotation
    • http://www.sictombbi.fr/ckfinder/userfiles/files/girukisid.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/kilip.pdfIn PDF document text
    • http://capital96.com/userfiles/file/36170787399.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902073241.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/87182669346.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/44878988774.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394d521193e---vawepavepinog.pdfIn PDF document text
    • https://aneri12.cz/res/file/54860646510.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/77348496326.pdfIn PDF document text
    • http://precisao.org/files/files/nenafuzadulufitupida.pdfIn PDF document text
    • http://cartopack.be/Images/file/48899727349.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/31298947313.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/pazaguterimaziti.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/7049320623.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c8f843ce5---34019636992.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/89105497352.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/zuremun.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/46080568984.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/tizigilibugoxisobe.pdfIn PDF document text
    • http://ativn.com/upload/file/6348517140.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_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 10900 bytes
SHA-256: f31ced079700e7902ef6af15add2c0f5c58631ab968835af0b764762c3dc3487
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 17588 bytes
SHA-256: 00fed3992ac1f04e03db5da6563c15be8d7aa05c9fd4e4c1042ea26e62d78943
font_02_sfnt_off000127c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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