Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d0f92cca40accc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 16:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 05ea6f9517d8708a8df7976306fe2085 SHA-1: e2af35c7c43f401cb69423c3107f682a3b466da1 SHA-256: a0d0f92cca40acccb5f41921c5459add7dceb509c9aa6f2683068fa23b308119
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and the presence of external URIs are indicative of a spearphishing attachment, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://domario.ru/userfiles/file/40602731808.pdf In PDF document text
    • https://candbco.com/ckfinder/userfiles/files/17764630613.pdfIn PDF document text
    • http://cabini.it/userfiles/files/43381289873.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/vubatuzabodatemuzizunu.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/81636426077.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/ragosezuwuti.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315201e6a0b---dojabibi.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/65029167462.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/32678930956.pdfIn PDF document text
    • https://magatek.com/documents/file/95414193556.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/nirovinotaximapu.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/pixefanoziminejowerazovi.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/80646317634.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/81345935270.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/zajemuto.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/pipijenojer.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/22660082951.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63ba2315d---28011341232.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/munumoneligivilonafi.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021971829486189.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/17246898294.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/92936465321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=can+iphone+video+call+androidPDF 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_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 10440 bytes
SHA-256: 4023b038d592917cc275e1aa6ac75d8283a823780470d1b9430a9f52df35f42e
font_01_sfnt_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 17804 bytes
SHA-256: 204f19832ed994944a83fb230ebc6ea128bcdca36a3794babc1ace5e1523c5a1

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