Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8206759470538de…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 15:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4722fdfae8a36e90f69d9005c900ae8a SHA-1: 0ca6ef37c5e90d5c38fa847facd077736656883e SHA-256: d8206759470538dec08b38ffec4c718e95a2ac5a7380f9bbc336f664059b87ac
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and links, suggesting a link farm designed to redirect users. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the structure and URL distribution point towards a malicious intent, likely to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://guijek.com/userfiles/file/lorabof.pdf In PDF document text
    • http://fusiongrup.ro/userfiles/file/dulowabubezimudakorive.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zodufege.pdfIn PDF document text
    • http://ifap.it/images/file/90207406100.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/vifevulazilifomon.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/75419299023.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/puparegolizigogagidozinid.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/58280945654.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/xipakekaba.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109012145159176.pdfIn PDF document text
    • http://glassick.com/userfiles/file/tuvajifusuvamajopo.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/61018838297.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/kosidobapupafitozage.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lenegukukogizi.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/73031500666.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/44190981719.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614615129fb12---59062233283.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/toxaze.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/51122074789.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/52693905221.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/89831552799.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130b37a7f0f9---tomot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=chat+heads+in+iosPDF 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_off0000b1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CC 18356 bytes
SHA-256: 154b588bae87f570eaf8a000d2bbde3519c279a729e155248006cbdee9540d7c
font_02_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 10232 bytes
SHA-256: b3fbd050fd73e01870a49ff1ec1da52272416808327dadda3101c6b2a7692974

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