Malicious PDF — malware analysis report

Static analysis result for SHA-256 b553a4157c9de0b9…

MALICIOUS

PDF

81.3 KB Created: 2021-06-08 20:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 33208cdacb0c110ffdc5a13197cd378a SHA-1: 5935adc0c536dfc1020603d069db87578e89d705 SHA-256: b553a4157c9de0b9216fdc4b1b50aa60bbbdab6321e28c6227784fd274de771f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are hosted on disposable domains or redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/pbw?utm_term=mario+party+the+top+100+cia+download PDF link annotation
    • https://vogowabiruzo.weebly.com/uploads/1/3/2/6/132681596/83d3ae.pdfIn PDF document text
    • https://sugabora.weebly.com/uploads/1/3/4/3/134369176/253e4e8.pdfIn PDF document text
    • https://lodoxaravejow.weebly.com/uploads/1/3/4/7/134719504/tuwezaserap-xelosazisik-getutemisaf-gogoluke.pdfIn PDF document text
    • https://tujulita.weebly.com/uploads/1/3/4/6/134687611/6119da50b.pdfIn PDF document text
    • https://wabavavopip.weebly.com/uploads/1/3/4/3/134317653/85bc632c94e7822.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/7187b2a2-69a5-4ac0-8352-2442d18b9051/can_a_coleman_catalytic_heater_be_used_indoors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22fdae52-7df4-4ad9-8cf2-d8aaae11f52a/tofoz.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144601650/40177821301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74a20ed-3832-4d2d-9e85-18fd4ca0f4ae/kenmore_elite_washing_machine_parts.pdfIn PDF document text
    • http://xefobukeza.pbworks.com/w/file/fetch/144598572/wudedudafiwi.pdfIn PDF document text
    • http://mizelabe.pbworks.com/w/file/fetch/144599367/must_mustnt_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c5b92c-061a-49b0-b2fe-c2b1bb2b48a7/vishnu_sahasranama_stotram_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1c4a0f-e8db-4184-8c73-99c67cbac091/android_5_google_account_manager.apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf28f1f-1669-4411-a35a-c080bcea004c/what_is_the_chemical_makeup_of_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e405631-4749-4a1b-8d65-3c4b951cb57d/nujagikuwujivenarelu.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144506292/does_cp_company_fit_small.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/f/fancy_pants_adventure_unblocked_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b59fccab-e7f4-4c99-b5a6-7763e1c04aaa/18250071401.pdfIn PDF document text
    • http://xigivesupi.pbworks.com/w/file/fetch/144729405/how_to_bypass_icloud_lock_on_iphone_6s_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2389a9d0-74c1-4efa-be76-e78bb7bc2b07/15698001310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781eb08b-f36d-4897-8bfe-e690cadc2463/dawn_of_titans_mod_apk_1.37.11.pdfIn PDF document text
    • http://maxasol.pbworks.com/w/file/fetch/144677280/english_vocabulary_test.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_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 5376 bytes
SHA-256: 62cb38c8f945e431c86ae90ad3b0a6faa411ab0a8657a1634d7d84316c48fa48
font_01_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 11384 bytes
SHA-256: 11a8a08e9b8c96e2c2d6a6277074e58ae7b0049d5850b9f3e13060dcd9cde07b