Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcb94fc5d663d3e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 19:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 254e2c364d48e72057d621f68eb58aee SHA-1: 2e7ff4c748e10e210fb8108d729e3ca26de84ba3 SHA-256: ddcb94fc5d663d3eafd5255fbea92b231ad6ce532465c3e25f6eda1be4b2724b
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external PDF files hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for downloading and executing a second-stage payload. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://relaxzenter.com/uploads/files/tulixunakikixumezupiwo.pdf In PDF document text
    • http://flapboxes.com/userfiles/files/9260534613.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/tatorosexalefun.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/32722357628.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/17625491967.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/fuvewobuj.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210910200649.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/20936889779.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/bubosoxurapiwoz.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/24612026844.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/5121276251.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/30093628895.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/gokidiwidipasugupaduf.pdfIn PDF document text
    • https://tessuno.com/upload/files/61399916a3a85.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/guvifolotukag.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/26ceaf30854a956f747f2a33461a26c7/ninutemotun.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143a09a2beec---vowujelelazilakura.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/nutowawawopemudedam.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/98178181927.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/99588804201.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/54712181053.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/88700020512.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/nomigako.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/fumesosajatajonapu.pdfIn PDF document text
    • https://wonkingchina.com/d/files/tawuperunona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+house+of+the+dead+2+androidPDF 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_off0000b108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 14808 bytes
SHA-256: f8d2b4cd7c113831589aac1ac2e512a517af026ed973528b20476bec3e7a3e33
font_01_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 10588 bytes
SHA-256: 60af0092fba4ad460f8d6e8965528d91d7caabf018955d6abbef891732663394
font_02_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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