Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b62bda15169507…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 17:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 192b3ab486cd4ab769ffd410308720e1 SHA-1: a7bcee0615169eaea44b284323b6d2d1c3d1ceec SHA-256: 33b62bda151695073bee138d3781f601f7efb9574e77369b0b9113869eeb7fac
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/aik29lk1sue6mbh4o3r81intg3/7507487899.pdf In PDF document text
    • http://baobianhkhang.com/upload/files/mokexokusuwubazel.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/kowolofasodikabisanesev.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/gajar.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/55225803559.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/37336706445.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/nimemiputaxizise.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/18807107416.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/62331090040.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210902204714.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bupujo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/rowavewowelar.pdfIn PDF document text
    • https://ijp2.com/contents/files/kujepola.pdfIn PDF document text
    • http://thevale.us/userimages/13985101218.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/ripekurerololof.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/nefavagegadasuxujezez.pdfIn PDF document text
    • https://jss-moms.si/upload/File/tagemalokoxazu.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/ramefafojugezelewi.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/liziwufi.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42579537928.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109050205012106.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/53520544373.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/83214699084.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/2810288873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sonic+adventure+android+apkPDF 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_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 10628 bytes
SHA-256: 345d17af3d8f9c22f460e035c63d2b6863f2cbc5f3329cfc9d47833476c28e89
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 17976 bytes
SHA-256: 9233a0f0ae8a3685ef0573516a00293ee3e0d945d61d6b7634a39681c43fb598
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1