Malicious PDF — malware analysis report

Static analysis result for SHA-256 923652e6c845c5fe…

MALICIOUS

PDF

82.5 KB Created: 2021-10-09 22:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7c74c6ba308975b0bd8fc99e0c882439 SHA-1: b1059734fc9c8a4f2a648774a0c07b203e362cc2 SHA-256: 923652e6c845c5fefd5167c5e30ef3dd010299e5eb68fcdcafd3355aca1c11f4
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=greenhills+shopping+centre+opening+hours PDF link annotation
    • http://hsound.ro/images/custom/file/kodaxizinen.pdfIn PDF document text
    • https://10fci.org/userfiles/file/16552181300.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3a7007e9ef552f723e8e12982d5c678c/tewegimejanimezobetomar.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/pajujoninesi.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/20108193466.pdfIn PDF document text
    • http://kccmaul.com/files/files/vigusuzanuluxojewimojaw.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/lunisamulabawopupa.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6ca55b3de---40132096962.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210926030602_MzQwNzg3NDUyODM=.pdfIn PDF document text
    • https://wmu24.ru/media/file/madoletep.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/regozokifebonomabepabixo.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/96671612678.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/33829707516.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/fedisasolubipibufarugolu.pdfIn PDF document text
    • http://yibetter.com/data/files/nesefaruvifozotuxarexokol.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/buvawuba.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/wasudofalonitavuvesufap.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/99739893952.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/4287474686.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/14505752855.pdfIn PDF document text
    • https://lordoptika.hu/files/files/57620789057.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/mogilezoviladobojeb.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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 10632 bytes
SHA-256: 92feb2deaff0646d09ec5f9e5b8b57569a361a62fc12ea19a3297b4861b35716
font_01_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 20208 bytes
SHA-256: 57b478e143654cd4706c3db6c4c4baf8551073f3233896f89d338f98e2820e13
font_02_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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