Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fa86428bdaa877…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 17:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f5c422830349f8171780cd1192ce265 SHA-1: 066f05b3a4c13df04b5976961d2eded87b62a213 SHA-256: b9fa86428bdaa877aba7527039e0b5a07bf520f0232c0886024fbe9fc99ad3af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://projetovm.com/uploads/files/85767205691.pdf In PDF document text
    • http://ototavandosemesi.com/resimler/file/rofavumixixanarofo.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109080653004101.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/14721357267.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/78664314789.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/narogesenuk.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ab46127f---wuvamul.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/14832693301.pdfIn PDF document text
    • https://vpmemorial.net/images/file/kalinovumubig.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/lugixufogazuxozapojoze.pdfIn PDF document text
    • http://wernitznigg.at/files/kodev.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/81877933787.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewor.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/fomoxiberekoziwen.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/gexufexodujeb.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/buxatexerovuwezile.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/14675521222.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/nozadesemamamezi.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/42281612348.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bfcc9a61ffdb15b706ca09171ef5d444/jewokezagazo.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/15934840195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=app+para+cambiar+el+tipo+de+letra+en+androidPDF 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_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 10628 bytes
SHA-256: dd5ed011aaceb0d584d57da7ea0f9f5767aa6b19022078c02b86784f669863e0
font_01_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 18908 bytes
SHA-256: 156a5c3f7b70a1a5c20a0ae271df02197a84e51871ff1a69f64e8b8858b05aba
font_02_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.