Malicious PDF — malware analysis report

Static analysis result for SHA-256 935a52d4e84bf916…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 02:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4f199f7ee9761cb55a560d9296c0638b SHA-1: f1ea22f69ab330d264b90cdc523033f325aec68e SHA-256: 935a52d4e84bf9168c71d20f26c5f33fd6227f2747aff3b4b8ad0099b7229a35
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document's structure and link farm behavior suggest it's designed to direct users to potentially harmful websites, likely for phishing or malware delivery. No scripts were extracted, but the presence of embedded URLs and the malicious redirector are key indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+is+ou+in+eyes In PDF document text
    • https://cdn.sqhk.co/puxolika/gjgijih/how_to_make_a_paper_mache_knight_helmet.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/ujaifig/30630403279.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/jbheK1A/free_real_world_football_cup_2018_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_6027b657dc7de.pdfIn PDF document text
    • http://muvezada.iblogger.org/karosare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407756/normal_5ff5d27277b9b.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/hagfgdG/baganiya_song_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/4JhhkpK/pusuwiforezugoluf.pdfIn PDF document text
    • https://cdn.sqhk.co/telapunojawu/SShcvhg/darunakaluxuparubevowoli.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/kifNiaM/debomevugunaboga.pdfIn PDF document text
    • http://souve.me/gimovewu2th8v.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/jcjjmh1/-_34-_85.pdfIn PDF document text
    • http://runmasten.online/what_kind_of_jobs_are_in_public_administration0jn1t.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/ijiaWih/small_business_board_of_directors.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/hdijA5w/modern_warfare_server_lag_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5fcd2902624d7.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/hjfCK8S/business_administration_jobs_salary_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/a1ge7JQ/language_translator_app_free_download_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokogukuvuxe.rf.gd/zuzakusofojatoxe.pdfIn PDF document text
    • http://ninesunugata.epizy.com/83554830377.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/happy_birthday_coloring_sheets_to_print.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_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 4760 bytes
SHA-256: 6582c720119c165541f4c706de471e452cb423c908d37d94ce0305e51c8d6ab0
font_01_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 11428 bytes
SHA-256: eb7bd308decf2360264db6ecbe36d6a8e0106b4e903873cd0c03b76bf40f3a7c

Open this report in the interactive analyzer, or submit your own file for analysis.