Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbf7df1a53b9ce8…

MALICIOUS

PDF

75.5 KB Created: 2021-04-05 00:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e61c3fec8e04905a02ecc185bff12766 SHA-1: 9da2f415fdb6b3162fcbf0cb4b2e577c1050892b SHA-256: 0bbf7df1a53b9ce88d66013fe19fc6f9f4d16aad9fb08165dbb447a1746adabd
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://resalured.ru/123?utm_term=automated+logic+training+manual PDF link annotation
    • https://cdn.sqhk.co/liminekaj/jahdFje/24201081426.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/ic9gfhj/9077990139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5fd28907760da.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fe4816a6568f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428038/normal_5fc8a2dac19d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/45965549131.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_0ee3619af27b4790a4cd2a6164130f04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad3b9d6-a8fa-4788-8d2e-8baaa548c6da/67988068326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f32d92-5ae4-4adc-9433-62b9ef8deaad/what_happens_in_game_of_thrones_book_1st.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d8bf5c-28ff-4c0f-be73-3b53f4856aa6/food_safety_auditor_salary_in_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/20579798896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199ec3d2-820b-4267-bc3b-43d91731e11b/marketing_management_job_and_salary_in_sa.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/rick_joyner_apostolic_ministry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70585288-e890-4a77-bb0e-e8c556bc1834/physics_textbook_class_11_maharashtra_board.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_c6b8991e9cd84f92871d6e644f9ecb23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/55550695465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/164d1e1a-9e58-4170-80ea-70bb67b402cc/lixewat.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/reformed_classical_apologetics.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_d5b6276af6b943ccb2c73b7953bf58c2.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_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 5068 bytes
SHA-256: 4d49a4d8d9b8ce197c3dae0d7e7f0c8967ba60d481ef9895a1c1ed74db5615d0
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 11296 bytes
SHA-256: abd6905db062e9ea093b94af6086a43f8d40ba0a9c3bafad7f14b0f8d9991f8f