Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c51133c1ce14893…

MALICIOUS

PDF

76.7 KB Created: 2021-04-04 21:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3885488112fff4078529fad6c56eedcb SHA-1: 54af9a4f146859a740fbd37b639e509a5ebad70e SHA-256: 9c51133c1ce14893e4044bc6798442893922dd59bb7d120b80dd0d414c9c0c23
186 Risk Score

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 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://lozipotod.ru/award?keyword=nift+sample+paper+2020+pdf PDF link annotation
    • http://trudogoliya.online/somewhere_over_the_rainbow_violin_sheet_music72tgx.pdfIn PDF document text
    • http://de-bewertung-889562.icu/high_school_science_lab_safety_symbolsindut.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/rChiXiW/lutalasujisowekovewinim.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/dgdVgjU/princess_and_the_frog_songs_almost_there.pdfIn PDF document text
    • http://yoga-italy.space/bahrain_police_jobs_2018_application_formamr8k.pdfIn PDF document text
    • http://electriccannoz.club/what_kind_of_charger_does_note_8_usep91p8.pdfIn PDF document text
    • http://gatorama.site/suing_for_discrimination_in_the_workplaceonyqi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_317aca25ae454d88ac37ba1ac2c6c390.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_3de3c764fc254f2ebe103def4aca7b74.pdf?index=trueIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_daf38186787f4002a57499af9d61505e.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_af8dd4146d604b76a75dc8b1859815d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezonijida/20992999499.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/tenewuvubusowa.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/list_of_game_of_thrones_books_in_chronological_order.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_21d5e1eaadc04248b5c0c704a845550f.pdf?index=trueIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_385f5643daad480e875050584d036881.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_bc38475813344be8b50121284c1fca20.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_0e5a612d56ac44ae808466299f1b33e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusabifef/rigowetupemogaf.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/html_full_free_download.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_e898f87008474cefa5cfe2462f2a6a68.pdf?index=trueIn 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_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 5432 bytes
SHA-256: 7d81eedf84c31348ca9166be400fec6e83882fe348a9c5baa3e5a740088e9a53
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10996 bytes
SHA-256: 4b06671b7c23807ef7bea1c3fe4dd57897c21f37111ae627edaf0b7e14b10856