Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4f112e498135cc…

MALICIOUS

PDF

96.1 KB Created: 2021-04-15 12:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3c8b821842d55f185fd0d9320d179486 SHA-1: 2b20d883b39329c98d184a980cacdf027f4c922b SHA-256: 5e4f112e498135cc04a27df00d51ff2fb9b1d80ea53cce12ea155f7e7b00c9d1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=differences+romeo+and+juliet+play+and+movie PDF link annotation
    • http://dimozakebaba.scienceontheweb.net/rejexabetaburarijubuximis.pdfIn PDF document text
    • http://wusumomijo.medianewsonline.com/define_birth_rate.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/lorivemavexol.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/concept_of_sovereignty_in_political_science.pdfIn PDF document text
    • http://nesegejisivinu.medianewsonline.com/kakofedavavorejojuzobote.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/can_i_notarize_for_family_in_michigan.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/princeton_review_sat_practice_test_download.pdfIn PDF document text
    • https://nanewibogexuro.weebly.com/uploads/1/3/1/3/131382113/jizikejanaw.pdfIn PDF document text
    • http://mifirejetevina.getenjoyment.net/21060351532.pdfIn PDF document text
    • http://buxeletifexid.medianewsonline.com/ketumule.pdfIn PDF document text
    • https://womijepadake.weebly.com/uploads/1/3/4/4/134476187/keketawovoxureluluwi.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/ce199944-6a1c-4ac9-9a30-57c4b928a012/36722369934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e325b4-bab1-4d05-a684-a5410e345039/adobe_package_design.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/bedigi.pdfIn PDF document text
    • http://jinugiwi.atwebpages.com/laxajez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20b6c6a-edd0-4cbe-95e7-b59ddc7e08b8/61137334130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69127635-5c22-4f95-9579-a757941762a5/53513781705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8886c74c-1d2c-46bb-8a3e-b45e5ae6fe95/navafodu.pdfIn PDF document text
    • http://furipurisebete.onlinewebshop.net/nekuvumiwofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3bfaf0-ab13-4a87-9f8c-eb8e071ba919/the_little_oxford_dictionary_of_english_grammar_sylvia_chalker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d11832-ba97-4746-8094-08266e92e6fc/how_to_get_rid_of_cystic_acne_scars_naturally.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 5420 bytes
SHA-256: 6bdaf9dc653f8066471b78447092be4ae94d895c3b99af7fa925e176cfe6aec4
font_01_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 13128 bytes
SHA-256: 521f8c607349ce71e22d9637cf02c6b6dd4afa52c0997bfc0fe1803462811011
font_02_sfnt_off0001632f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1632F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3