Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b08f217b617751…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 14:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 367d9a60143c79d467207ed7ddb6749a SHA-1: 2de3deac9542cbbd2b9511519ab638507f8e2670 SHA-256: 78b08f217b617751f30f8f376dd42a43badba27613f2d516805f28467032b8de
66 Risk Score

Malware Insights

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

The PDF document was identified as malicious by an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to external sites, with a high concentration of links on disposable hosting. This behavior suggests an attempt to lure users to potentially malicious content or facilitate further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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://dynamic1984.com/user_file/file/36420431193.pdf In PDF document text
    • http://wangyiphk.com/userfiles/bavafipugomipiz.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/jasinamudod.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/49251848332.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/laporerunitapuju.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/rubebodovuxiratonama.pdfIn PDF document text
    • http://oris-am.com/editor_up/dipuzonetotalusudenurodo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/08e3b60c85c2c3c7ccec27264cc06a85/xaxofumuzafefifevuxe.pdfIn PDF document text
    • http://hainfelderteich.at/xaniporufenavulalibo.pdfIn PDF document text
    • http://www.celso.org/download/nepowikunogisur.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/98017727045.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/kagapefasafana.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/41254149289.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/webomolujameramopomuse.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/dezevixakotuponod.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/63367025750.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131395643ba3---6332516172.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/wuwatebupamifatebuxeron.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/50749559321.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/5250342848.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/juvugupofugatezevuvasike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=and+then+came+lola+full+movie+online+123moviesPDF 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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 11132 bytes
SHA-256: 6455a717e5835cb79af624913da478c836d1311c67c849ddc59cb0ac24b432db
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 17272 bytes
SHA-256: 417da1882d1e3861ed710edf0fb0f9a285b975331965c62f09209767212046c8
font_02_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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