Malicious PDF — malware analysis report

Static analysis result for SHA-256 d876ce02945eeab1…

MALICIOUS

PDF

91.9 KB Created: 2021-03-15 21:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ff563cdd0fa3c1e598524de82c5cf912 SHA-1: bdf1ab6d6213cd302ce0ebbe15ae5e030ec50d3a SHA-256: d876ce02945eeab1474670fca61db608189901c9b4d922e778cc4ed5b2796081
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 0.9995

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://nipisod.ru/123?utm_term=confidentiality+agreement+employee+template PDF link annotation
    • https://wudunuxez.weebly.com/uploads/1/3/1/4/131453857/9fddbcf797c9f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_6016a78003223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_600a1d2c1bf50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501645/normal_60055bb77ba35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fd0fead6e306.pdfIn PDF document text
    • https://vokijovagugudis.weebly.com/uploads/1/3/0/7/130776016/pozajelusogekufidu.pdfIn PDF document text
    • https://zotapuzuvekef.weebly.com/uploads/1/3/4/3/134323554/zubiduboj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5fd8b694138ce.pdfIn PDF document text
    • https://tokitojunetibot.weebly.com/uploads/1/3/4/2/134265352/pufimil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_600fb70e7f6d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6016c9874d1a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8b7f37-9a3a-454b-b8b3-de2e5dca466b/wakow.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/capitalization_worksheets_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2eadd3-c8ed-4ff0-b5cb-0b68e5de2849/plc_programing_ladder_logic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af582d15-22e8-4b60-a951-bbc8243e67d1/scag_freedom_z_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/holt_algebra_1_textbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12798df1-a062-4a0c-afe8-fc3e58f9e8d8/bissell_proheat_2x_pet_pro_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/annual_leave_request_form_word.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/section_8_nyc_rent_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/kwarapoly_post_utme_past_question_and_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/28156770532.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/rome_2_seleucid_campaign_guide.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://scripts.sil.org/OFLIn 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_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 5192 bytes
SHA-256: 505bec72533d377297400334e6f0e2d649730e26b50feeaeb107c86a187d7f2c
font_01_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 11020 bytes
SHA-256: 78fb394fb39d1156c83aa1c4243fb0a40abf739335b78535a7cb505f3cede9af
font_02_sfnt_off00014ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD1 16088 bytes
SHA-256: 1264a556fabc14c69ec4ba4609a347bffa09942e523f09f2774283a283413be9