Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d53021f11f5e97…

MALICIOUS

PDF

78.6 KB Created: 2021-06-11 03:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1588f8df111f66adc512ca8edfbb21d7 SHA-1: e73bac525510447133cb8a77f04af239c91382dd SHA-256: 42d53021f11f5e97e02009fa8c8cd4b3ef61278532a9facd002e4bb05bdcbe4d
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://nomylo.ru/pbw?utm_term=gk+questions+and+answers+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402948/normal_606df90b36028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_606336865021f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_606126a45c52b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_603e9cd780ab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497075/normal_6063b3281a87f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_603688ff59a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_601336b5db5e0.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
    • http://wejojixi.pbworks.com/f/vakigilubitiduzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d551a797-9fb2-4996-9425-a8005cebbec4/fewomulotupim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48432795-c63f-43af-8c11-6afc8f4a307f/what_is_the_biggest_counter_depth_french_door_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10df146f-6b94-45d6-afbf-23040745c96a/software_testing_methodologies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060358c9-086d-4012-8046-1c75b0ab07ba/xewejupaxone.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/f/how_to_program_a_dish_remote_control_to_your_tv.pdfIn PDF document text
    • http://vogituvu.pbworks.com/f/zogefak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff71042-ec3e-4197-8467-3c0b9916279d/what_is_religion_for_kids.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/innovation_management_and_new_product_development_trott.pdfIn PDF document text
    • http://xanovobuxebo.pbworks.com/f/freddy_fazbears_pizza_mexico.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/rna_transcription_worksheet_answers.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/activate_windows_using_command_prompt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69050a73-f861-4872-bc65-a39a86b9bc23/formula_para_convertir_de_pulgadas_a_mm.pdfIn PDF document text
    • http://magogopowo.pbworks.com/f/usa_up_and_down_words_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca1254f-0220-42fe-ae65-9e2bacd8daec/godejinezelavopeb.pdfIn PDF document text
    • http://zotemizivob.pbworks.com/f/87405759629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1333cf32-8c01-4175-9a77-394b7128d1f2/58598124019.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_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 5280 bytes
SHA-256: f27084e5d7db28f42fb0a1bd9949271e6eec370e4e15d4964544cf556c419c01
font_01_sfnt_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 10368 bytes
SHA-256: 939ffab2c0f9727acfb60c4b68b2affd302132c163c42960a97b0a9b823648c9
font_02_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2