Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa5be12005a6f7d…

MALICIOUS

PDF

86.3 KB Created: 2021-05-14 03:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c05c8ca6903df702678d76e38cd4d9d SHA-1: 746c0da623f9722d95457949c3656e35dfd35502 SHA-256: 7aa5be12005a6f7d2eeef75759ea13399493ffa9c527d1752ecfa760337348e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=m+audio+keystation+49+advanced+functions PDF link annotation
    • https://cdn.sqhk.co/fenozidu/7wgfgiA/57695039005.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/covering_letter_for_visa_application_uk.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/lista_adjetivos_calificativos_en_ingles.pdfIn PDF document text
    • https://lutapusudifo.weebly.com/uploads/1/3/1/0/131070527/4968041.pdfIn PDF document text
    • https://fugunizowad.weebly.com/uploads/1/3/4/3/134364761/wuvur.pdfIn PDF document text
    • https://waxaveroguwako.weebly.com/uploads/1/3/5/3/135344917/4748455.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/hilJhei/dalifitedawuxol.pdfIn PDF document text
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/62939cc9.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/c2f48951-5007-45df-a50c-46c953ffc19d/95597651147.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/44689576175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb61d84-cb0c-487a-9198-a83ab0123284/us_army_enlisted_rank_insignia_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0295de-5bed-403e-83f0-2f12676a2f79/wimpy_kid_movies_in_order.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/reliability_engineering_courses_australia.pdfIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_935565042cd24978b1b041d6c3cc0aca.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_54fd7c95b9da43aa948ba75aba4033d4.pdf?index=trueIn PDF document text
    • http://pavafisufopu.myartsonline.com/advantage_and_disadvantage_of_social_media.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0caff8ea-e5de-4647-b902-d51e8bc6a900/notuzobuvamuzaxegir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94db7475-8822-4513-a433-97d756f95107/the_vampire_diaries_season_1_episode_21.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_e72771692c5642a5bd6b9ec497c14615.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_681ddc7d9cc840949225015e97adf668.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/49727820504.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/c._g._i_full_form.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_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 5364 bytes
SHA-256: 0fbb0dca4bc13150985afb33ca15b0808d0d72a4df4351f709352a4c0c385d06
font_01_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 10696 bytes
SHA-256: ac64d6f042ba9d427416df5a1f5885801d13c74e7f114c276034852d1b659975

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