Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ddcdba05a993fc…

MALICIOUS

PDF

79.1 KB Created: 2021-03-30 05:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e86b1ea8de01c7bad799d425c1c295b1 SHA-1: 74ac1f1f01db0962bdc024c52fcbb1e7d906fa2c SHA-256: c7ddcdba05a993fcfd8268b9e6e387ac4d522add470ab27564c2f2965822b262
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically pointing to 'crophysi.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'ellipsis and substitution exercises', likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=ellipsis+and+substitution+exercises+pdf In PDF document text
    • http://xazoxaruxilovo.iblogger.org/instagram_for_android_4._4._2.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/16480721880.pdfIn PDF document text
    • http://wokanetavim.iblogger.org/how_to_save_cdr_file_to.pdfIn PDF document text
    • http://novofikupeneda.mywebcommunity.org/35960585328.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/british_council_ielts_reading_practice_test_with_answers.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/06d89567-b5d7-4854-aead-1a18688b1837/hp_laptop_says_plugged_in_not_charging_windows_7.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_010f5628f67244759cb107621efdd19c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29220751-428c-4448-b1ab-94c56771212c/nawagimodorepogox.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/how_to_use_a_quote_for_a_topic_sentence_dbq.pdfIn PDF document text
    • http://vizawog.epizy.com/81344350536.pdfIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_c1b52c1529c3412c9c9eced0d44e3775.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/41405860514.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/how_to_eat_fried_worms_full_movie_fmovies.pdfIn PDF document text
    • http://libafal.epizy.com/btec_applied_science_level_3_book.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_b7d0d142353b4e2fb9d210ae835a50be.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_53f44ec48d714dba9f57f573d298f6b3.pdf?index=trueIn PDF document text
    • http://mepitar.atwebpages.com/7007793355.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/14854306860.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/why_does_my_furnace_run_so_much.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/finite_element_method_example_code.pdfIn PDF document text
    • http://niwanabumupe.epizy.com/tanita_bc_418_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a55a75-a1f6-4c57-9834-16d9dd331fe1/how_to_thread_a_euro_pro_464xc_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5d6efc-2723-40dd-9f0b-2e3139db0758/air-o-swiss_7133_humidifier_manual.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_79467e7d8fef400ba9e7b937343d1bf0.pdf?index=trueIn 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_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 5196 bytes
SHA-256: e38590e3791d708a3206ca9b0e5a8c6c3164918730f0917cf1d5e4c6752fff65
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 10396 bytes
SHA-256: 8bdf96c7e54e9c3dda48fcd9c412c0aac0a52001cb15aef8f97a1b51a69ce6fe
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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