Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e26bd8f6dacb46a…

MALICIOUS

PDF

79.0 KB Created: 2021-06-07 13:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d63eedb92c414b14127a164655889823 SHA-1: 954becc1071f69bd7f29b0f11f6be140d6ba255d SHA-256: 4e26bd8f6dacb46a4fd01e729806d3ca6bb1acebe8b56ed3e0d9c27e1513cdfa
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 0.9998

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://crewmak.ru/pbw?utm_term=does+zales+do+free+ring+resizing PDF link annotation
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/1368508.pdfIn PDF document text
    • https://lidelituni.weebly.com/uploads/1/3/1/4/131452972/9058916.pdfIn PDF document text
    • https://tekipagitew.weebly.com/uploads/1/3/4/8/134871071/lelunivoma_mewofusukonupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5fc6c1e2-9bf7-4d43-97e7-06f101e6d268/diccionario_espaol_ingles_escritura_y_pronunciacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e281b66e-06eb-48d1-86b8-404f88186766/xugajarakegak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a58cc20-5701-45d2-9094-902b36930155/how_to_calculate_transformer_for_led_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1876fb7-f0a3-4301-901e-68295bde569b/ic_engine_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd106d1-dd61-4daf-8091-e3d9732e1c91/how_to_analyse_data_using_simple_percentage.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144659667/partes_de_una_rectificadora_universal.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/f/xurubimozosog.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/cheat_sheet_asvab_math_formulas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b12c419-ea36-48d8-997e-d9e5d5374003/1402110913.pdfIn PDF document text
    • http://zepupifob.pbworks.com/f/kumimejatekulakoxulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ef89fe-be36-4593-bd2f-cb21c0a4e5c3/29834200882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8140c5ca-8706-4e57-a9f6-e68b8b55c9a1/77728687138.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144607950/wojupo.pdfIn PDF document text
    • http://tavaretaz.pbworks.com/w/file/fetch/144765465/lego_brick_alarm_clock_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225a45e6-ff6d-4406-b5f4-82cb35002a64/troy_bilt_xp_7000_generator_wont_start.pdfIn PDF document text
    • http://zulamiz.pbworks.com/f/how_can_i_improve_my_listening_skills_in_french.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 4832 bytes
SHA-256: c2fe54b0f76a29c80367d75133028adddbf9e7b7e4e6dc0be1607e3a97a27ab4
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 11760 bytes
SHA-256: ddaa6c7a889676335890646f44c8c3599fdcf9a8df79a1b8825b0390072394ef
font_02_sfnt_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e