Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66c9abf68332785…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 06:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac4f957a63899cd00afccd31dd482f6b SHA-1: 2af99782f895d08cec70bd79ed6064d14f1a00e5 SHA-256: a66c9abf683327859372dcecd0206c637380fb723a5458462ae8d029b95772a3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with one heuristic specifically identifying a link to a raw IP address, indicating a potential attempt to direct users to a malicious server. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://studiocommercialedelpiano.it/userfiles/files/4812082456.pdf In PDF document text
    • https://yourwebcenter.com/files/file/59316597098.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a92517793---17583307385.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/28665321084.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/sapetago.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/77306381088.pdfIn PDF document text
    • http://irollee.com/userfiles/file/44366777938.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd141aa88---53315372560.pdfPDF link annotation
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/91492981245.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/57339028499.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/xisefofut.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/98275636036.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/84720843226.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kizofonojikufebi.pdfIn PDF document text
    • http://ave-france.com/pics/files/92152089202.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/wewapinedamebovezelurude.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/tisudedepujatevadem.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/12806310312.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/regidikupufugafepoxigawap.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/27684535391.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/92503105380.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/50496540588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=maxwell+leadership+bible+free+downloadPDF 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_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 18180 bytes
SHA-256: dbed372183ec15d4aecd4c8f2c81554f337225345e44a1345a2a4c051c6588dd
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 10820 bytes
SHA-256: 66c2d6d90ada51fac1c95571778dcb8741a1bcdc01875e103cce26969ee7ef4a
font_02_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1