Malicious PDF — malware analysis report

Static analysis result for SHA-256 896d7acbc5bd1204…

MALICIOUS

PDF

79.9 KB Created: 2021-03-30 06:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e921315715c3f1c7f9e8d90f941cf33 SHA-1: 78a760c00fc0b4ebf049ade74d65c381b132a068 SHA-256: 896d7acbc5bd1204fa05ebcff021492c589014fd5038633cecc4806fa071ac70
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest it's designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://bologen.ru/wix?keyword=dead+effect+2+apk+obb+download PDF link annotation
    • http://xajavawinereko.mywebcommunity.org/61456214937.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/12770340533.pdfIn PDF document text
    • https://xavuzilutose.weebly.com/uploads/1/3/1/0/131070872/97c7d6b453ef0.pdfIn PDF document text
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/8974746.pdfIn PDF document text
    • https://foniliwis.weebly.com/uploads/1/3/2/6/132695455/7b4cf0f85.pdfIn PDF document text
    • https://namovisurov.weebly.com/uploads/1/3/5/3/135338224/1934495.pdfIn PDF document text
    • https://degadita.weebly.com/uploads/1/3/5/9/135965793/e0f9903.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/a_grief_observed_c_s_lewis.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/5a3e5a87-1153-4fb7-9b8d-6f39e097a95a/nopigofamuleriwetifedopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0c042a-f966-4986-9c1d-dca7aa3c7188/how_to_replace_the_correction_tape_on_a_brother_typewriter.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_fcb97c6b5547497382bc07f7da3ae848.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c8b5ba-517d-46eb-89d5-0ab52ee64c4a/family_feud_game_download_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951b01dd-ee3c-4a2c-a02e-21694fe9e6c1/scientific_experiment_lab_report_example.pdfIn PDF document text
    • http://vakifavu.onlinewebshop.net/british_council_general_reading_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81108601-64c5-4b5e-a6eb-98fdaf9b3e4c/black_diamond_headlamp_battery_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0dde61-0e47-40af-90b6-1ed8399cf4c4/sorita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4db23dd-56a4-4c41-b3a2-ba9cf45562ec/review_autel_maxicheck_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47896ef-e9e6-49a6-b0d3-4b829ac21656/how_many_pages_in_a_court_of_mist_and_fury.pdfIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_4bba396117ba4ee29d4446dfc24e0a69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f66d44-a2bf-4735-ad28-19268d17068a/24139487098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0f337f-5d6d-4377-b336-12cd0610e405/86254953760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d7e4a1-f4b1-45a5-9637-57c211b2ae25/how_to_find_a_negative_z_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f545f7da-229f-487e-9407-9f8cd6f101d2/dizimuz.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_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 5304 bytes
SHA-256: 90b43cd6a365309591919e470e03ae538d54a0b87c9e0f530138a14b1bee2529
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 3280 bytes
SHA-256: 0b3782a72a0c200f8872ca409705f575f6d03a6c9e6e59e5c9396084b0339c98
font_02_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 11136 bytes
SHA-256: d837096a7764898ce897e1461dc4b7ab41430bf1f5e373ce52ed60cb44d93880

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