Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36da9d9c4df61e7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 02:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39d905473c819abd75f6c03009c7c515 SHA-1: 9a042df2f84acd80a8982669a1b281403e9a487c SHA-256: b36da9d9c4df61e7fa318de1ca0dac103df5017055443d33f81928b5134c45bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of many unknown URLs points towards a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://peoplefineart.com/assets/202109/files/20210914182050907825.pdf In PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/mikefifezenox.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/vedokibiwasuzudonaparip.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/35454414913.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420c6401cb0---pinikubaju.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/nexakozetafes.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/raluwid.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/nowibapiladujezekikurapu.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/powugado.pdfIn PDF document text
    • http://regmac.net/userfiles/files/67913294989.pdfIn PDF document text
    • https://intersat.lv/files/file/pamarefidewerekatorafidaz.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-4/20210904011947384820.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/41287083894.pdfIn PDF document text
    • http://poorclarescork.ie/images/difokujupawujojaja.pdfIn PDF document text
    • https://jck.ro/userfiles/file/duvaf.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/52035528030.pdfIn PDF document text
    • http://abwrva.com/uploads/files/31728599742.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/91862406670.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/8478187743.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/38805162017.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/nutibekafi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30c5d2110---pokiw.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/watisixiwexowadut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=watch+kimetsu+no+yaiba+the+movie+mugen+train+online+freePDF 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_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 11288 bytes
SHA-256: 3ee42d41a91f9ebbb8a3e25df278d463b2cb686a005cc7117c8e839ed22cd68e
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 18896 bytes
SHA-256: 6f03aab4b152da00b1c0fde0509e7cb09a1d9487ec8d6395339527e4ad48d4fd

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