Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d0c56aca257373…

MALICIOUS

PDF

73.9 KB Created: 2021-03-22 04:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 683105797fb06d816b8bfc07d9e51e19 SHA-1: 969f0ffa8d2f6b86fc04f08667a3ec2ba91228d0 SHA-256: c2d0c56aca25737348ca00b9e7623d2356314164591b1fae7819ac7b7e73e2a0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=winter+survival+kit+for+car+list PDF link annotation
    • https://cdn.sqhk.co/gosukutusu/igjchen/lareveru.pdfIn PDF document text
    • https://cdn.sqhk.co/laxiroroweno/hhgvzal/no_crop_online_for_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/g8jibjc/adf._ly_auto_clicker_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/59yLi3x/tifukefibogafenu.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/bihjahd/come_fare_gli_sticker_personalizzati_su_whatsapp_iphone.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/41210891321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_1678e63dfa704e238736e206c6116a99.pdf?index=trueIn PDF document text
    • http://zokepufa.epizy.com/accounting_101_philippines.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_490ae7636db141a5befa99330b6734c8.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_e5edab9222f640fdab5a7553c93462a5.pdf?index=trueIn PDF document text
    • http://peledopa.myartsonline.com/english_speaking_course_book_file_download.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_fac8a13c07f64cc297507fc8f66bf52d.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_a7ab7bc68da14ebb81ee72b83dbfba6f.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_fc51f03b319f4785a0dbb849f3b929af.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_573b753d7f6747c28c7b13b79549386a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/bhagavatam_tamil_free.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_0acd440b01b74e868d1c2bac05b6048d.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_eef876185d264a5d8054b09cca123234.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/73077913889.pdfIn PDF document text
    • http://mamisiz.rf.gd/free_avast_antivirus_with_licence_key.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_3633a51c398e4709a8641ca9fc580748.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 5012 bytes
SHA-256: 432c554b8bfad4495482a625d4dd672683736714a71e3035ffb48e021dbe6d68
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 10432 bytes
SHA-256: 7344f741f429bf9d418eb06fea96c0460839c6ca5c693b4d5ddda8313960af90