Malicious PDF — malware analysis report

Static analysis result for SHA-256 b135fcab6093f698…

MALICIOUS

PDF

77.2 KB Created: 2021-03-11 09:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: edd58fab44a9a9941450fd829162ac23 SHA-1: bd1e608c73a0865ceb4417c50ca8f01a082cfb56 SHA-256: b135fcab6093f6985765cd15f3329dc1f3bb8d831b7a0d8239621aaedca53a4a
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it's part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to tutorials and specifications, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://mezovuduw.ru/award?keyword=autocad+architecture+2020+tutorial+pdf PDF link annotation
    • http://sopafekidis.sportsontheweb.net/wasapirawepubuledukafi.pdfIn PDF document text
    • http://remastacer.com/37478617719zgu3i.pdfIn PDF document text
    • http://onlineeshop24.xyz/snapper_riding_mower_instructions90yje.pdfIn PDF document text
    • https://cdn.sqhk.co/zumumolebajo/jcihbyl/lomosegenoliva.pdfIn PDF document text
    • https://pikisavejalanab.weebly.com/uploads/1/3/3/9/133986241/gawanodufapape.pdfIn PDF document text
    • https://cdn.sqhk.co/vibupiwoxaro/fjhgeBU/suzamilufegitotonajuvew.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/c125ab7d2.pdfIn PDF document text
    • http://contarinihome.com/mujodarujafaxizukuvt99mb.pdfIn PDF document text
    • https://fudolimag.weebly.com/uploads/1/3/4/5/134586879/fofumajiwo.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/business_communication_notes_for_b._com_1st_sem.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/J6iaijk/ms_project_management_software_free_download_2013.pdfIn PDF document text
    • http://like-store.site/the_solstices_and_equinoxes_worksheekqlut.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/hf4FNib/invasion_of_the_body_snatchers_trailer.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/how_do_you_write_a_tok_essay.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/10387878880.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/xisakazelelinim/9418431111.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/2007_honda_shadow_vt1100_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/greatest_showman_never_enough_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/samemuzafedumipimoru.pdfIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/letter_to_birmingham_jail_summary_sparknotes.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_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 5328 bytes
SHA-256: fcb820f40deb98a4e9145682cab769d81dfa448e03f7f3eb09f0f05feecd288f
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 11664 bytes
SHA-256: ce4c14015926c76c5ed20de4123f015ddb6f8c379bd291382fcd2330db74de50

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