Malicious PDF — malware analysis report

Static analysis result for SHA-256 972106c66d40e3e5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 04:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ccc643979269d868660ecbb29f41f25 SHA-1: 518871c4375197bd0dd23d1f3af46e12821d632a SHA-256: 972106c66d40e3e560cfc4dee1e2198b007c2e072b13a4d54e2c20956e47151c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links pointing to potentially malicious or phishing sites. While no scripts were directly extracted, the nature of the link farm and the embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://baoyi-chuck.com/ckfinder/userfiles/files/88347202175.pdf In PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/56503078230.pdfIn PDF document text
    • https://dhesient.com/media/morexejilufulo.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/nokelipobegoweraxenex.pdfIn PDF document text
    • http://fkhd.cz/data/img/rojugusokozija.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/kuwenipa.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/jarinoxujow.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/80224605531.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/69766530641.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/28122129009.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16141148e0dd64---25797006942.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/93755140119.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613f314d68e25.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/72111371072.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mapoxubifaxuniduzoraxi.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161340a855f345---xetepuwuweko.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/108935834.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/59374500461.pdfIn PDF document text
    • http://htwy.com/upload/file/lumogadimol.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109100006401660.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/13728025915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=film+semi+live+streamingPDF 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_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10376 bytes
SHA-256: 94095564d9cf01e45c9c6a05afdeecb3f2593b941cadc9f567291bc64d608537
font_02_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 17476 bytes
SHA-256: 81acc8816622dbae40739618cb1de614f9baeabba836ff49e84ae38127db0399

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