Malicious PDF — malware analysis report

Static analysis result for SHA-256 912149f895329cd3…

MALICIOUS

PDF

94.1 KB Created: 2021-05-01 21:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dddebc6678334e895ac404431365c9db SHA-1: 5aedc29b145b61409f6c3300660d60a1dab0b5b7 SHA-256: 912149f895329cd31c1c8b4a3b722b42144f41cf1bd15f1baa55e504ce5b71f3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=monster+5e+pdf PDF link annotation
    • https://cdn.sqhk.co/tasokuxu/icEhdgi/66644373876.pdfIn PDF document text
    • http://sait-ok.ru/craftsman_lt2000_service_manualaue44.pdfIn PDF document text
    • http://yildirimotobursa.com/605619777574ko1q.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/gcZa7jh/98410042264.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/XihhOqL/minecraft_tower_defense_2_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/d1gQhjb/my_digicel_plan_sms.pdfIn PDF document text
    • http://itsamorem.com/senabufavosikiwenakabatozmtlz5.pdfIn PDF document text
    • http://badge-verification-center.com/firefox_67_offlinek8ena.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/dVhefhe/tumepuzesefajinubiza.pdfIn PDF document text
    • http://ovca.space/biverilikovafusegq2o3.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/iaxrYa3/whatsapp_status_video_download_15_sec_new_mirchi.pdfIn PDF document text
    • http://4escam-bot.online/toburugudimuranepijexi1ng1j.pdfIn PDF document text
    • https://cdn.sqhk.co/xamevetap/hRq3jic/65452734670.pdfIn PDF document text
    • http://tihefers.online/what_chemical_do_you_need_for_coleman_hot_tub28wcr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_54816f27b7af4c7b82840e452dbbb3bc.pdf?index=trueIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_5508ce8b86c64084bf31aa19cb217c4e.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_d4a740fc8cf54f2c86e405f9b3950bc7.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_cd3c8ef018f84ae996211200f57397ce.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_4e2a3c910a0f44cdbbb5561a002772fb.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 4660 bytes
SHA-256: 1a9f440028a4864a15adb4bcc9684bcc81a9a211c104ab94510069de475b788f
font_01_sfnt_off00013649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13649 11568 bytes
SHA-256: 68b93af00069b6455a1d5017b482c86c9637e6e177ab1895cd38b94d4a4609c7
font_02_sfnt_off00015bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f