Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82c57ff5bc5f8ed…

MALICIOUS

PDF

92.3 KB Created: 2021-04-28 11:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f85026be7bcd15e8ba80d31c69b7f750 SHA-1: 57cf85a789e375950e989c4cb127501916c12564 SHA-256: a82c57ff5bc5f8eda79722cabd5efd5e5a7fe163e690cbdbe42f1097f052bf07
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses an urgency-based lure. 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-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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=what+did+alexander+hamilton+accomplish PDF link annotation
    • http://tupaxeguna.scienceontheweb.net/67329811784.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/apgli_loan_application.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/strategic_management_concepts_and_cases_competitiveness_and_globalization_13th_edition.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/winolunotulodiz.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/14101742417.pdfIn PDF document text
    • http://itanto.space/8663609578266rbu.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/juegos_de_cinema_panic_2_y8.pdfIn PDF document text
    • http://bachanalytics.com/weapon_sounds_fivemoq2wf.pdfIn PDF document text
    • http://kibesamifi.getenjoyment.net/verbs_adjectives_nouns_with_prepositions.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/zakofakadibuferuke.pdfIn PDF document text
    • http://tamawasobo.sportsontheweb.net/46685420487.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/braveheart_sheet_music_piano.pdfIn PDF document text
    • http://levantegroup.net/tipos_de_investigacion_cuantitativax1dkl.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/55136274277.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/definisi_irritable_bowel_syndrome.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/dfce909f-7c49-4f88-b918-4b4cbb396788/english_textbook_class_10_cbse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c9147a-8cb4-4411-81cd-d23998167801/principles_of_geomorphology_thornbury_free_download.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/benim_hocam_eitim_bilimleri_notlar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ddb38cd-88b0-4c3c-a0c7-857a8882626a/call_me_by_your_name_free_full_movie_google_drive.pdfIn PDF document text
    • http://foduxidepozipiw.myartsonline.com/15242714430.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_off00012d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D49 5396 bytes
SHA-256: 5a1e0adeda917dfd9db3b314bfb11332ba5fc4fef04efbe7c5a8224380645281
font_01_sfnt_off00013f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F82 10640 bytes
SHA-256: 3f73671b6fe1f08ffc4c855b2768c1a04c48871acc3988b4a4d9c7d95035dcb8

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