Malicious PDF — malware analysis report

Static analysis result for SHA-256 715a1d38c7acbfb6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 19:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89332fb583728eff891961e662cbd42c SHA-1: e2a343d844ed77a9c5da4cd1c673bb9894b6bcc6 SHA-256: 715a1d38c7acbfb65370d5e397db11e95588b87c35ec78a11db9452c98017c65
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=woo+plus+mod+apk PDF link annotation
    • http://noithattamphuong.com/upload/files/349282947.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6141b3ce301d1.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/83751939209.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/minonodawipujo.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/82931109890.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/24071751676.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zejevejiwotogotituka.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/14535169738.pdfIn PDF document text
    • https://datenglagi.com/contents/files/8640908656.pdfIn PDF document text
    • https://penal-garazh.ru/files/wodunikujexugidijokakilir.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0cdc8c962---66148116441.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/fufupabevewuloxututivod.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/34150869830.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/30916482770.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb34eb850---77640536462.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/bivazobebuxagujutozesodo.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/milideronifo.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/wixorimixijedenoxusi.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/kovovoxigus.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/takikawowikosaral.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/xokema.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/gixexoneb.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210912_5C8EFD52EDFE3597.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/26392136938.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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 10212 bytes
SHA-256: 1676ccfd0252691f461b6e1bda6f801d0830a6d6de82e84a0d23b3c60c199f5d
font_02_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 19264 bytes
SHA-256: 655df761148c3b72e3b2e3b9490e855b6c1f3113f73320be9c939168ed698da6