Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ab0b88cfb8f7e3…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 23:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 023d64619f612eef46e98a2814138d8e SHA-1: 1c89bd59887795ccb5b9410cb21d5994daae2dab SHA-256: 99ab0b88cfb8f7e360bbf34225d8adc000ee28f2378537c50080796c48fc5a7f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and URL distribution suggest an attempt to redirect users to potentially harmful content, possibly for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://piataafacerilor.ro/app/webroot/files/userfiles/files/86744771800.pdf In PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161429150192f7---sovowosagapunosoxisezi.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/43836391092.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/tojenizelimugibizusaga.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/baponukoku.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/nijifajupapile.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109121951102931.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/96692194403.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/vofojogukorazekose.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/82735478155.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/46170759054.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nutigojiputus.pdfIn PDF document text
    • http://fitviewer.info/files/file/kopujulizafasakimozato.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/3698946008.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/43044410923.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f466f120e---likefid.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/dutadaj.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/lixuj.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/pebuwaletemuraf.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/68264490183.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/pivigemiwivizowojip.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/sujijizozejajuwexexij.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/debuzo.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/jobewozake.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/kopovajivezerepolomexer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mi+redmi+9s+price+in+bangladeshPDF 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 18324 bytes
SHA-256: 1b00d87724d322413f57db45e93f52b3dabc1a1fc8a8b654da9ef5aa08d80716
font_01_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 11044 bytes
SHA-256: 22297d8928310babdfd8cee4af7443624875152fea12b7b1635a1f14a3228db9