Malicious PDF — malware analysis report

Static analysis result for SHA-256 798e6ed8985aa6fb…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 00:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9dfbe326c19c301011a0601c99a6cd2 SHA-1: ad224af14c8f8aa5bd08a1396bdb97447c817f1d SHA-256: 798e6ed8985aa6fbbb1c59f6f0de9fed576b2c8a23530dcc55c3381823e313fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, a common tactic for distributing malicious content or conducting phishing campaigns. No scripts were extracted, but the overall structure suggests a lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www-a.euro-ex.net/images/blog/file/relurisomenipak.pdf In PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/jajipugamizalaja.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/4029477574.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/5884859416.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/73574020259.pdfIn PDF document text
    • http://htwy.com/upload/file/sebila.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/27/4723750671.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/1354778850.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/diladobomoletizozofobix.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/rafumejirilibedimulax.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3bftqnl3t4vnbkc09c5o5uh8tb/limirunu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/sokogafiwuvexavajibi.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/42197133292.pdfIn PDF document text
    • http://checopharma.com/upload/files/nunigutogibozowoji.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/rabagifuvisar.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/dakegufoxamab.pdfIn PDF document text
    • http://it-hair.com/userfiles/51996893288.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/semomepotipakosikupufonig.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/59686925361.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/doziderojejagubugofabumo.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/tupifagimokezukalilefab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+android+emulator+for+windows+7+64+bit+4gb+ramPDF 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_off0000ae8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 11372 bytes
SHA-256: eb0247d27377b942b32996a2c09fe2f2b6c6027b3a9e0ed9cd8da07d681ab857
font_02_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 16652 bytes
SHA-256: 9257df85e2194918a88dd52b5d13e36a80b85637cb0018f9ac0d76f025311145

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