Malicious PDF — malware analysis report

Static analysis result for SHA-256 647f36202ae6d017…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 05:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52bc883fd56922f21516a8fb35f4bae3 SHA-1: 5c4d48afc6abc940c86880fd39c47d413f71d8a5 SHA-256: 647f36202ae6d0177cb239435f4f5536a21f58cfd720a5e69b395d4461c50b88
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, many of which point to external websites hosted on disposable domains, indicating a link farm designed to redirect users. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=best+app+lock+for+android+download PDF link annotation
    • http://besttailor.info/ckfinder/userfiles/files/miravisofusobinibewawur.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/22231145476.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/xotamekeropuwepawafifudix.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210920070611118.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/25020247800.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/46952842097.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/50009093451.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/56225770448.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/radar.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/88223546997.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/jujibosikivu.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/gevewomazulasa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0ofqsvo3nnob6cq1276n5crdi5/85507842301.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff9ba33d5---22364482290.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/boxosa.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/lugujo.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/nefomimenetuzuwu.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/bizokesefipubasofibanux.pdfPDF link annotation
    • https://gencerenerji.com/resimler/files/tewakovetopisi.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210914024747.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/34327338127.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/rasimunakavapijipoge.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/xopopasif.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/10034368238.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/nipafuwemukibire.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_off0000c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 10844 bytes
SHA-256: 1ab87d1b125520ad271d0d250d3f15ffb3b2c5e8b619b835fe01df0671f2b535
font_02_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 17532 bytes
SHA-256: c70933e035f1138bdf793a5f54fe5c5cd54de845b172a350073c276a1b9d5e57