Malicious PDF — malware analysis report

Static analysis result for SHA-256 939008b6af5dbfd3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-25 03:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38d8b1568ca56a8d1169a8908c014d1c SHA-1: 159b71f5ebf25c46c2a3dd835dd644ebfb1b1b63 SHA-256: 939008b6af5dbfd3c8a12961927567b0a58ca190243a7b5d1d1182056bfeb33c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute or phish. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score indicate a malicious PDF, likely used as a lure in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=64+in+1+game+apk+free+download PDF link annotation
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/91131255613.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/88706172091.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/21289080275.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/94960950360.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fedotetube.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/96321124253.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/84933289989.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/gevijerijezon.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/30916756742.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/bewewunadi.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/mabekibefe.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210910174637936661gb6mh.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/79796495589.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/fepufagiv.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/24187463687.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/tulofimidapuwix.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/80538941574.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/dimomu.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/39901457760.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/kanesisuref.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/wefukoxisano.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090917284473499.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16311435418476.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_off0000b9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D1 10952 bytes
SHA-256: a48ebd97b50f41f7f0a6be045ad8aa4e133e175615abd9a799daa50054c930ab
font_01_sfnt_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 19768 bytes
SHA-256: 8c73291da03581709a1a58559568388788d947bc812dc6c96db3e80554f41b9d

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