Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed05774079c501a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-26 23:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89b3cb6d22e56adcf204c5f061a9b7de SHA-1: 4f17079bca98edbe5e8bd23ccc2e719ae48583b7 SHA-256: aed05774079c501af6f066f8c6a7304b5eed1a4a52003a41aa3d79b411eeec95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to a network of sites, likely for SEO poisoning or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--80age2amlc.xn--80adxhks/pics/images/file/muximanejalif.pdf In PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/67756848813.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/64297005858.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/dababexavomugetezilufas.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/wobewotononatoxab.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16144c5f06216f---woxufer.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/popazinemutarigakobomesar.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/262110399365.pdfIn PDF document text
    • http://eichler-kammerer.de/14236871962.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/gagevimunozobat.pdfIn PDF document text
    • http://pi-consulting.ch/download/gotafajopemitofuzoxof.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/57298004077.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/13228175748.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/bujogubukuguwuzatot.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b55bf58e8c---68737237285.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/darugutarazutugemobeka.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109231815126536.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/vufobowasosowuf.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/55880057441.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/87346221236.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/difejeg.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/59066611738.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/21039957045.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/pavupilete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=madame+butterfly+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_off0000b5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 10520 bytes
SHA-256: 0ddedda3dd1975d17709aaabab8b663f42162e7ab89aefe49b3a2fd7061e8113
font_02_sfnt_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 19612 bytes
SHA-256: 4e3e9f4059c03b688c6494a3226091cff015c8623314302cc507d9bdc1c49b7e