Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec68e38292e2999c…

MALICIOUS

PDF

74.4 KB Created: 2021-10-03 14:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 44b352fa71e8ea55b2aaf3af189f545f SHA-1: 432110617ec0bb6becab3ec3ecc685891e93618d SHA-256: ec68e38292e2999cd634294294b47c8688e0f3fb0eb58f3ca8581262438ad84e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be link farms on disposable hosting. This suggests a campaign to distribute malicious content or phish users by directing them to a large number of external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://finara-v.com/file_media/file_image/file/43366813354.pdf In PDF document text
    • http://pytextiles.com/userfiles/file/ritanipapumajiz.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee033392ed---90874262715.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/gikonatuver.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/55700127453.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/35566675183.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5sgp0una3lj14ippojtaqq2dbk/25471246581.pdfIn PDF document text
    • https://cathita.vn/upload/files/vuvatifuvokefemuxas.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/79556993682.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/nuzoz.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/benufeso.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/xutapixojojejifuvefuremab.pdfIn PDF document text
    • http://beijingteye.com/upload/files/sibujebijovuvatowidogak.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/14213920592.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/85994389400.pdfIn PDF document text
    • https://ratosatu.com/contents/files/wijanurotufifavafu.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/tonorunokudutekugo.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/44746736321.pdfIn PDF document text
    • http://marketingnews.fr/images/file/22462766615.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/zajukowilolusigibafiril.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/legasujapumi.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/34907512702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=oscillation+and+waves+notes+pdfPDF link annotation
    • 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_off0000ba0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0E 10688 bytes
SHA-256: 77f3087eceb823c1492cb97736ec9e373998155e595a72dd6dfaa72497934f69
font_01_sfnt_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 19052 bytes
SHA-256: 39ab7c950eeca539000440422d4ae67faa93190ec145840e6f30f5f8d6282d76

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