Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2386af4d2261098…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 12:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f9799030bd68e8ad9f07677f280b47f SHA-1: 60b058fe4ad9d664a4d5364bbbe51f2e4dffbf70 SHA-256: a2386af4d2261098135581897aa5bcfc5c0a65b851d03af34bd6bd4533f7f31a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrusted sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or downloader attack pattern.

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://media-get.ru/userfiles/files/nakidit.pdf In PDF document text
    • http://gibisch.info/files/files/buwawarovekekedejunuzi.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/8155599529.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/21669436211.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/zofebebiwowuxawazewederaj.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/14782327955.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/popupilenago.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/lidepujop.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/xopibagad.pdfIn PDF document text
    • https://superpart.com/files/73786038013.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/57402816972.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/75172097956.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/fekijitusirukit.pdfIn PDF document text
    • https://alutat.com/data/file/30702142793.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210901_072334.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/453109515.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/welafuros.pdfIn PDF document text
    • https://redac.ch/upload/vawanored.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/kevoxiremejifikogawe.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613c09f767690.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161320cbdb98ec---33960841638.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/xosopus.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/94362025454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=machinarium+apk+obbPDF 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_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10520 bytes
SHA-256: e47bae02e78d8019b54ab130fc6a312f92a2c5c75532c41c87ed8365cdf1f312
font_02_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 16816 bytes
SHA-256: 526775fd114e8e20db7c217529a4dd825f8366f87ac38bd91fda0279ce5807c4

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