Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7b90fc04fc676b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 05:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79636ec1d373734716500de800a94d91 SHA-1: b688898b43868195ce2f8143ddab57961e369435 SHA-256: 1b7b90fc04fc676bbcb1bbcfea1fe07efcd7b339a17d29685f4fa37b534c0694
134 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 embedded JavaScript and numerous external URIs pointing to various domains, suggesting it's used to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=star7+live+tv+4.0+apk PDF link annotation
    • http://metrocars.london/survey/userfiles/files/goxexinibatotuvelosufi.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/kamolan.pdfIn PDF document text
    • http://edeins.com/userfiles/file/gabulipagabosav.pdfIn PDF document text
    • http://poorclarescork.ie/images/vibemiporasokapog.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/dasawowifavadoka.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee7e3c75---84432221315.pdfIn PDF document text
    • https://sapporopools.com/contents/files/35398136635.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/movofosominerepo.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/70278875719.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/42044913259.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420096996eb---vozotupotawijomurezo.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/40830138141.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912022028366929.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/rorapano.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/40612671941.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/zebaxolupovozawevekanop.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/kinepi.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/42482123213.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/13424645976.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/fufetukesetiz.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/30793941143.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/33049963985.pdfIn PDF document text
    • http://tochuchoinghi.org/files/gatidomubegejapibina.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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 10404 bytes
SHA-256: f284a7d98b0ab0efc02c3e49399b1345c3c4beb6e946f39e851037dc217099f8
font_01_sfnt_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 17704 bytes
SHA-256: 5902dcdd256b4e2bf69dd087240df018fd8f7816778a6d3825e6c98c2540e6d7
font_02_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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