Malicious PDF — malware analysis report

Static analysis result for SHA-256 2accec563cfe09bf…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 23:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b21eec8964d0594c31accdf66ae406bb SHA-1: ddc8e58d687c3859ffe94f48b3d5770b89924b9d SHA-256: 2accec563cfe09bf9191edc522d8de2f5ec9ac0a9c4b80929a892a229bcbf843
114 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests a link farm used for phishing or malware distribution. The document body, though obfuscated, hints at a lure related to banking app security, likely to trick users into clicking the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=is+it+safe+to+have+banking+app+on+phone PDF link annotation
    • http://energyexcess.com/userfiles/file/morejofefowojidosexenuz.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210919152008_1256701355.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210917_201932.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/wusimajovenaroron.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kibabemazobefixirujokopi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/27632669196.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210918_5F48B046CE841406.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/65442606775.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/93224184386.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/vaxelodax.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/lewogowokipaxudov.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/50381431735.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/42883756916.pdfIn PDF document text
    • http://www.bash.cl/media/file/94724940553.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/13019440920.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/83320013938.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109121551062759.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/lubonumik.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/finaxosubogarobanon.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/3105033964.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145eca0d54e3---29768832965.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_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 18856 bytes
SHA-256: 317c3cab3bb319ce3d755b96dbbffe1daa4591b8e950583e986acf81deaf5a4e
font_02_sfnt_off00012b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B51 10740 bytes
SHA-256: 69b027be2bce8de104fe889d6a0e377643a57e61c4b6c55611c04525645f5e74