Malicious PDF — malware analysis report

Static analysis result for SHA-256 858340aa05974bcf…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 23:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f71109583a787b6f8556bf683d09206d SHA-1: ccd2200b5c6fe07d296fa17c30097096ab691f18 SHA-256: 858340aa05974bcf4b2b5c248e8d8a55a02889cadd3ff45b2e7b3c2ff27cd5b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external PDF files. The presence of external URIs and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to potentially malicious content hosted on various domains. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://hotararicedo.ro/files/files/nujipodowerunaruj.pdf In PDF document text
    • http://phuwangnam.com/user_file/file/72528772265.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/69fcad9c3f8828b155ba143cb981e382/87632235924.pdfIn PDF document text
    • https://ocw.tw/uploads/files/saxemebabuxufekunigibu.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tagew.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/91755951309.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/19583108546136c63b60113.pdfIn PDF document text
    • http://chinalabware.es/d/files/fanugipipikakanuwor.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/nuvorajolatolisajufeg.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/21088768930.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/ximab.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/54574165412.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/81121298264.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/wamepiwumopexib.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3cfc985a452b9aa5d0c6a93356763720/tavumusuzakuludozi.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/xirebivugepanuwavulov.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/visepanonorazanonifuwuvuf.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130562236cb0---dipotuluzejunutetisofakon.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/8164657298.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-01-22-51-29-50.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/nebosedupi.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/364512617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+transfer+data+from+android+to+android+smart+switchPDF 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_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 17884 bytes
SHA-256: 9feb7f668b20ee535736dc3827a18601cab5bdb0b72b085214aa05ed782c04ad
font_01_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 10772 bytes
SHA-256: 8072cdd7d060eb7ed71b8aaec4235a42d242b7da0f9206b8b4f119f88bc42db3
font_02_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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