Malicious PDF — malware analysis report

Static analysis result for SHA-256 30833920bdeca497…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 07:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cd5f82f6a5dfc431759a699224b47d8 SHA-1: 622608b0b6ac465d20391178a40c9981b1f2f3b5 SHA-256: 30833920bdeca4976bb8aa4bf8b6553ccf725e6d60dc9c02edbe655aa9cb2cac
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF exhibits characteristics of malicious intent, including malformed streams and a high ML classifier score, suggesting it may be used to exploit vulnerabilities or deliver secondary payloads. The presence of numerous embedded URLs, some pointing to potentially suspicious domains, further supports this assessment. No scripts were extracted, limiting the ability to determine the exact execution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://hiddencliff.kr/FileData/ckfinder/files/20210909_1222CB197645F8B5.pdf In PDF document text
    • http://sinostandards.net/upload/files/18990277660.pdfIn PDF document text
    • http://word.mn/uploads/assets/zelipikipudumavozajimutaf.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/80992743747.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/dumudowanabasomix.pdfIn PDF document text
    • http://maihome.hu/admin1/file/1203016976.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/momoxituzu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/660b7608c4d142cf7f6acf9043419fc6/4067789359.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/kilexirasumibo.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/topad.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9ff295cc0---lazuzomekinitapujuledupob.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/bufivumawogijo.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/mamiwavunibamabotilit.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/lajufewotaneliko.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/83818491346.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/12477721434.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/54510943527.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/lagitudibo.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/54032867638.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/sunaguwifudatosidegeko.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210925065132.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/88879871523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=quad+strengthening+exercises+pdfPDF 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_off0000b20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 10996 bytes
SHA-256: 071da0b243a49aa2c6757b7a248bb3dd605875068cdb75afd00dd59ba95a38ac
font_01_sfnt_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 18708 bytes
SHA-256: 3972829c1667c7ff215d984d561a929d933f2c8e5564ec43cdd67fb5f7a9c41d

Open this report in the interactive analyzer, or submit your own file for analysis.