Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d025e005f45dc31…

MALICIOUS

PDF

79.0 KB Created: 2021-03-16 08:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d5d163cdfe88fb96657e6dffc6a165c2 SHA-1: a7c925acd12b2ff8b55c3f7e8b676a6af7f3004b SHA-256: 1d025e005f45dc31f515658d6458227034af138a4181428ac206248a160cf571
184 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojanized document. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/123?utm_term=mind+map+template+online+free In PDF document text
    • https://cdn.sqhk.co/mogizufofuj/gdgcwjb/burger_king_specials_going_on_now.pdfIn PDF document text
    • http://sfhgfje5df.xyz/free_video_call_recordern77op.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/Asig0hf/85036002350.pdfIn PDF document text
    • http://allerop.xyz/mikupevimwk3.pdfIn PDF document text
    • https://cdn.sqhk.co/zeburozupax/8j6paja/auld_lang_syne_sheet_music_trumpet.pdfIn PDF document text
    • https://cdn.sqhk.co/vunofufi/hbshbgc/6571269417.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/a0c9b8fa-d194-4aeb-8a42-48fc65576667/nawubi.pdfIn PDF document text
    • http://luneruletiz.rf.gd/83991627235.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/lafowu.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/44717686585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d74f73-a313-479a-b08e-d41cbd657655/28300570867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67af2e6b-c9ca-4cba-b563-69bf3be6fd9b/what_is_the_main_idea_of_theme_for_english_b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e0c7d5-d54f-464a-8fde-d5e1b0461ee1/how_can_i_see_satellite_view_of_my_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372a8009-81b9-49a0-a4a0-dbff148671b0/67884675246.pdfIn PDF document text
    • http://bawexoji.rf.gd/wabinejakunoxuvuzozubi.pdfIn PDF document text
    • http://dopudovorapimu.rf.gd/vivifos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8baf671-3a66-4b71-862b-620234e5ef21/why_is_it_called_love_in_the_time_of_cholera.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/43438188249.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/bob_marley_songs_of_freedom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e3b628-0741-46af-b1ba-57125e648965/konurupapadado.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/3943803486.pdfIn PDF document text
    • http://vogokibogewete.epizy.com/79066449003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0369ed8-4009-4b22-b583-1a04cff446c5/pisubogomi.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_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 5012 bytes
SHA-256: bb136d7d09de78b22c63ce88f788578fa89781e3f80e2acdd47068af8ad24e5c
font_01_sfnt_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 11080 bytes
SHA-256: 7062381806541765143d7ac6676fe43d5b712154166f4e8bb581626360030e9f