Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87737b88877ba8e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 10:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7b02f4058a4e6a60ab62eab840515b9 SHA-1: ae07bb2a498345f18152ac9f98fecfb1b3ebcb71 SHA-256: a87737b88877ba8ea19d7f0c4361d27307a558226fa175378b10c6ff4b3cb236
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=rollworld+app+android PDF link annotation
    • http://akwarella.pl/user_uploads/file/zaloguzewomixorevasese.pdfIn PDF document text
    • http://praguetransfer.com/files/file/10711038534.pdfIn PDF document text
    • http://podarox.ru/public/files/lajafosabob.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/nepamabulepis.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/mazevo.pdfIn PDF document text
    • http://napiarsaigh.com/images/xejulat.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/97142756282.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/01te7q020ekh8tej4crbfv6ltd/fevedosibej.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021921051533624.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/mokipezit.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/60621751039.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/3925327003.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/96019412572.pdfIn PDF document text
    • http://standardamulet.com/files/files/52190609065.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/83157947514.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/lusifolem.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/2825327471.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/19622300151.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613552f42eacd---jekezaxunexuxelubol.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/zizoxomogoguruxutite.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/57810459860.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/9699445834.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/41316823804.pdfIn PDF document text
    • 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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 17328 bytes
SHA-256: e478f7fd703398474839f945a1ff277a0d7556796f5afad51dabd93e70ce86a7
font_01_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 10120 bytes
SHA-256: 1db6a9b8ede97eeb58cbd4c9d89756a2acbad4497ef9813fc10ed2c5ce11cd0c
font_02_sfnt_off00012bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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