Malicious PDF — malware analysis report

Static analysis result for SHA-256 4928a6a12ade6a44…

MALICIOUS

PDF

87.9 KB Created: 2021-06-11 13:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 017e5df5ab9067fb6271e36ae1a15655 SHA-1: 230cd81b0834a758407668695731b649db3f77bb SHA-256: 4928a6a12ade6a44cc7b06d881f327ed91d8ccd1f904aa7dd8b773d844a1c208
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 0.9982

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://drafthe.ru/pbw?utm_term=1st+conditional+exercises PDF link annotation
    • https://pajuxosam.weebly.com/uploads/1/3/0/9/130968950/bamalirexozuw.pdfIn PDF document text
    • https://neriguzoxivefu.weebly.com/uploads/1/3/5/3/135319498/tikimenimokiv.pdfIn PDF document text
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/06c62.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/55578270ab67c.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/47b8a007-4a3a-46f1-a4cc-d0dfaca6f283/kuvako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1ae96a-32ad-4751-81d4-305561ffc12e/74151767428.pdfIn PDF document text
    • http://mijatonevu.pbworks.com/w/file/fetch/145096017/wunuzetoluwuvadaw.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/31594822806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172d40a1-81dd-4f37-a183-72acf2fd1a2f/proform_hybrid_trainer_review_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b666b27e-ea87-4909-b797-a3581c40ca9a/tokalajesuz.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/lerawizop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f842da83-c4ad-4026-ab11-876655dc5cd9/zozupofamivikosam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf4cd5c-25a4-4fc3-89b0-1a27e19359d5/pocket_juice_wireless_charging_pad_review.pdfIn PDF document text
    • http://watusuxipidu.pbworks.com/f/22067944835.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/f/2006_chevy_malibu_repair_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d6ea7d-388b-4a70-806d-9d29ac40d697/is_town_lake_in_austin_open.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3372c3-8610-47df-8902-c3483256ed65/how_much_does_it_cost_to_repair_a_broken_screen.pdfIn PDF document text
    • http://juxivos.pbworks.com/f/how_to_set_up_jbl_soundbar_to_tv.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/what_year_4l60e_will_interchange.pdfIn PDF document text
    • http://zapibibilubo.pbworks.com/f/ritajezur.pdfIn PDF document text
    • http://xigivesupi.pbworks.com/w/file/fetch/144839805/minecraft_intro_maker.pdfIn PDF document text
    • http://biwonuv.pbworks.com/f/apk_windows_xp_launcher_for_android_indonesia.pdfIn PDF document text
    • http://rawumadakora.pbworks.com/f/errorless_physics_class_11_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 4744 bytes
SHA-256: dc460c02b4ccbac0c03302d65a1033b785c8a99c82b4d40aa437721e5678de00
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 14012 bytes
SHA-256: 46a07b062d1e65c4c4ed11b214974c4d69d98adbaacc510ef5a52fc7e590e54c
font_02_sfnt_off00012e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E54 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00014382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14382 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361