Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bec1e8185d0e442…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 04:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5fc31b3ccce24130cd5692e63af60e48 SHA-1: 508456dcaa4479cf79c69d6e82a1fb2e665dcf42 SHA-256: 7bec1e8185d0e4423d331c8a591fb4c4707b57527287daf09bbb32a9c256fa41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=turn+off+keypad+sound+android PDF link annotation
    • http://88cpap.com/userfiles/files/begujekovowota.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/wudurigodozibaxatelataxof.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/tikolezavelisowetakuvoru.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/12168296771.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/50874116113.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/zalojofebos.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/31536052872.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/45686621858.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210914_20D83DBD441A0051.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/segediko.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/somakurixuwilejegudu.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/fulujibagapataxa.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff87e2dd8---xuritanubegiz.pdfIn PDF document text
    • https://kawanmto.info/contents/files/pikelevek.pdfIn PDF document text
    • https://educhina.mn/editor/files/jujutuzuxonuguwo.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/21785223522.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/65400687952.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/97605790648.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/gevipurofuxano.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/7614356074.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd1856d6cd---boxupajawunisaliku.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902075030.pdfIn PDF document text
    • http://alkanboya.com/files/file///fisifejoxemevasu.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_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 10616 bytes
SHA-256: daebe74895688d7108c197ec024307df7ecf3c987af6ca3ca7997fd9dc8d37ad
font_02_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 19548 bytes
SHA-256: 9a8b1a2b969d0e9da7e7a948ef9732532c3c01070885b66ce485817c1d377518

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