Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b65a2838961fa5…

MALICIOUS

PDF

79.7 KB Created: 2021-03-08 08:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 46c26ac3c2ced8612c1d14266c9ffd9e SHA-1: 9fb54e353877474e56dc5fffdbd7ee6426e15706 SHA-256: 21b65a2838961fa5274277c1b9600a462a8259b937f60930a29ade9669f7fa22
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains an embedded URI pointing to a suspicious domain, which is likely intended to redirect the user to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://dugedepap.ru/strik?utm_term=acurite+rain+gauge+00875+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379371/normal_600a2990ba6bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5fdad9ec4adce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470839/normal_5fff548405f62.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/gajovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_602b97f18c846.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/67372162539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5fdc5216a4fa8.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/dusilujixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_602e7bfeed914.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/roomba_530_charging_error_3.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/how_to_learn_digital_photography_online_free.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/dinigugaxej/96819465594.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/milonelion_riddle_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d46130-5946-4eaf-9e3b-f39aa87752b4/ralph_waldo_emerson_nature_beauty_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5e9df7-2dc1-4765-8cd9-2a54e9ba9af5/zopojovewizirapo.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/telugu_calendar_2019_chicago.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/best_crib_sheets_organic.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/does_sat_physics_have_formula_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14b2e42-d581-4715-91eb-f27e3fa55cf0/59794727257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e4445b5-6205-41aa-9e00-87d74a49dce0/professional_development_plan_sample_for_nurses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5845097b-50d7-4c7f-838a-0b0095f326e8/dungeons_and_dragons_5e_starter_set_rulebook.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 5472 bytes
SHA-256: 195d93b8f7a4465f7bc1e17de2748e52986ee45c572e7df6e9834adbe9f7a40b
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 10408 bytes
SHA-256: 20b8c4e7ca0dfb1e621447d6b3179d2017b3884cf47be3472246094188a896f1

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