Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb79d7c6f0e4b7a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 23:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a1368824d9c244924034018ee7e5f4a SHA-1: 8bfcb07a961a1b3862b7dd33d0e7963c0e9c9650 SHA-256: dcb79d7c6f0e4b7a18044177e66f638ef243d34ff4e395250124d83a6a0544da
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits PDF vulnerabilities. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous external URLs, many of which are hosted on potentially disposable domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://techson-cctv.com/upload/file/4126446840.pdf In PDF document text
    • https://dolaodong.com/userfiles/file/94573559436.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/33403413501.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/57037618449.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/lowetujuxil.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/93854828621.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/kurijikepozuzimokelup.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/xiputu.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/45746619253.pdfIn PDF document text
    • http://ipublicity.cz/data/file/lanixewu.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/43961716090.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210913_B503B74536BA7175.pdfIn PDF document text
    • http://iscelenie.info/files/file/50907532009.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/65887983344.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/64076022191.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1125708785612f33a4bf22f.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cf29708eda08cc012538274775831744/laxoterimaj.pdfIn PDF document text
    • http://balatonfurediallatorvos.hu/userfiles/file/modupovi.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/rexomenakug.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/balijizenalopodefomite.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/75888091546.pdfIn PDF document text
    • http://rld-carbon.com/file/60909259223.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161456bc6259f5---japunujoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=monkey+app+apkPDF 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_off0000b12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12D 15944 bytes
SHA-256: 9d5a6c5191789c533cd85b2075823fba1690be57e4b49927d376a3f9323994c8
font_01_sfnt_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 9940 bytes
SHA-256: 9f4b61ba57ac620a343fe84db33be00d56c68041c723480b38517b41af0c99d7

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