Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75920fc2552b0dc…

MALICIOUS

PDF

78.0 KB Created: 2021-10-02 11:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2f1c092801880941462dceece473b5da SHA-1: 9eba4750c12b57d1bac7865838f01f3f40a6353c SHA-256: f75920fc2552b0dc0e8b2a2ebb28c6280c05075f7bca1998cdea4b577563fb63
134 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. This script likely redirects the user to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The numerous extracted URLs suggest a link farm designed to host further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=https+www+picktime+com+licensing+appointment PDF link annotation
    • http://langfordfinancialservices.com/userfiles/files/25424490324.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/29117039632.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/fezenugajikaxudidakif.pdfIn PDF document text
    • http://napiarsaigh.com/images/48891105305.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/79556816261.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/42391666732.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335cbb37d08---dexefatabixububu.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/xadekimenulatomiwamuteke.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/80787134061.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/jezibikidoveme.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/55015879871.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/gefedevegodoriw.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/rebulefudazitiped.pdfIn PDF document text
    • http://airzo.net/userData/board/file/lumetuduxozifutaris.pdfIn PDF document text
    • http://thaiurethane.com/userfiles/file/10665247308.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/51940668574.pdfIn PDF document text
    • http://upakuika.com/img/file/74283422495.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021093012433027.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/gavipidojosamogibobavowe.pdfIn PDF document text
    • http://saigonservices.vn/images/uploads/files/pajevevi.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/89818016135.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/wugorot.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/85548612225.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_off0000c08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08B 20888 bytes
SHA-256: 729927c088717b41678cb6a56150cd11bbcf691f2f27f70cfb64c88dce8fc90a
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 10784 bytes
SHA-256: b40b5d6ca16c7637a8e670b47615f08385ac2060f5ff5cb38fe88b32c097755d
font_02_sfnt_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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